Heaven's Lost Property
|Heaven's Lost Property|
Cover of the first volume of Sora no Otoshimono published by Kadokawa Shoten featuring Ikaros.
(Sora no Otoshimono)
|Genre||Drama, Fantasy, Harem, Romantic comedy|
|Written by||Suu Minazuki|
|Published by||Kadokawa Shoten|
|Original run||May 2007 – ongoing|
|Anime television series|
|Heaven's Lost Property|
|Directed by||Hisashi Saitō|
|Written by||Yūko Kakihara|
|Music by||Motoyoshi Iwasaki|
|Licensed by|| Funimation Entertainment
|Network||TV Saitama, Chiba TV, KBS Kyoto, tvk, Sun Television, TVQ, Tokyo MX, TV Aichi|
|Original run||October 4, 2009 – December 27, 2009|
|Episodes||13 + OVA|
|Written by||Rin Kanzaki|
|Illustrated by||Suu Minazuki|
|Published by||Kadokawa Shoten|
|Imprint||Kadokawa Sneaker Bunko|
|Published||February 1, 2010|
|Sora no Otoshimono: Heart-Throbbing Summer Vacation|
|Released||March 25, 2010|
|Sora no Otoshimono f|
|Written by||Ayun Tachibana|
|Illustrated by||Suu Minazuki|
|Published by||Kadokawa Shoten|
|Imprint||Kadokawa Sneaker Bunko|
|Published||October 1, 2010|
|Anime television series|
|Heaven's Lost Property: Forte|
|Directed by||Hisashi Saitō|
|Written by||Yūko Kakihara|
|Music by||Motoyoshi Iwasaki|
|Licensed by|| Funimation Entertainment
|Network||TV Saitama, Chiba TV, KBS Kyoto, tvk, Sun Television, TVQ Kyushu Broadcasting, Tokyo MX, TV Aichi|
|Original run||October 1, 2010 – December 17, 2010|
Heaven's Lost Property (そらのおとしもの Sora no Otoshimono , lit. "The Sky's Lost Property"), is a Japanese manga series written and illustrated by Suu Minazuki. The plot revolves around Tomoki Sakurai, a highly perverted teenager, who desires to live a peaceful life, but encounters a falling girl with wings named Ikaros, who becomes his servant.
Sora no Otoshimono began monthly serialization in the May 2007 issue of manga magazine Shōnen Ace. The first tankōbon was released by Kadokawa Shoten on September 26, 2007, with a total of 17 volumes released as of April 26, 2013[update]. An anime adaptation produced by AIC aired in Japan in 2009, followed with a second season, a feature film, and two video games. A third anime season is in development for 2013. The anime is licensed in North America by Funimation Entertainment.
Tomoki Sakurai is a teenage guy whose motto is "Peace and quiet is the best", but he finds it difficult when he has to put up with Sohara Mitsuki, his next door neighbor with a killer karate chop; Eishiro Sugata, an eccentric pseudo-scientist bent on discovering the "New World"; and Mikako Satsukitane, a sadistic Student Council President. One day, while he was witnessing a strange anomaly in the sky, an UMA (Unidentified Mysterious Animal) crash-lands nearby. Tomoki discovers what fell from the sky is a winged female humanoid named Ikaros, who soon declares herself to be Tomoki's servant. From then on, more creatures known as "Angeloids" arrive, and with this, he loses his peace and quiet, but at the same time finds pleasant things the Angeloids bring him.
- Tomoki is a teenage[note 1] boy who wants nothing more than a peaceful and quiet life in town; however, his life is forever changed when he meets Ikaros, an angel-like creature that falls from the sky and becomes his servant.[ch. 1] Despite being a shameless pervert, a trait heavily influenced by his grandfather and mother,[ch. 7,33,36,49] Tomoki is usually a kind and sincere person.
- Tomoki has a recurring dream of meeting an angel, who takes off into the sky to his disappointment.[ch. 1][note 2] While taking care of Ikaros, Tomoki strives to make her behave more like a human, and encourages her to make her own decisions.[ch. 9] While he laments the disruption of his idealistic world of peace and quiet, he admits he sees the Angeloids as family and enjoys their company.[note 3]
- After learning about Synapse's quantum converter, he occasionally transforms into a female alter-ego called Tomoko (智子) Voiced by: Saki Fujita (Japanese), Alison Viktorin (English). He uses his form to mingle with other girls so he can fondle them, however, when he is excessively sexually aroused or nervous, the converter overloads and breaks down, and ends the transformation. He also uses the converter to assume other forms such as water, flooring, or a bar of soap.[ch. 11,33]
- Although Tomoki is 150 cm (4 ft 11 in) tall and weighs 49 kg (108 lb),[ch. 19] he is usually drawn with super deformed parameters, except when he is serious or relaxed.[note 4]
- Ikaros (イカロス Ikarosu )
- Voiced by: Saori Hayami (Japanese), Brittney Karbowski (English)
- Type: Alpha, Height: 162 cm (5 ft 4 in), Weight: 48 kg (106 lb), Wing Type: Variable[ch. 2]
- Ikaros is a busty "Pet-Class Angeloid, Type Alpha" who falls out of the sky at the beginning of the story, and after Tomoki rescues her, forms with him a bond, symbolized by the mostly invisible chain that leads from her collar to Tomoki's hand.[ch. 1] She displays a very submissive, melancholic and subservient personality. Ikaros is able to grant wishes through the use of several techno-magical cards.[ch. 2][note 5] Despite her passive appearance, Ikaros has displayed moments of aggressiveness whenever Tomoki's life appears to be in danger. Her Variable wing type is highly desired by Synapse.[ch. 14] In the manga, she mainly cooks for Tomoki as well as watches over him when he sleeps.
- Initially, Ikaros has a poor grasp of human emotion, due to her programmed setting of high battle abilities and high processing abilities but low emotional abilities.[ch. 22] Despite this, she eventually develops feelings for Tomoki and falls in love. She is willing to do anything to gain Tomoki's approval, and will go along with his perverted schemes[ch. 2,16] and sacrifice herself.[note 6] Her face is mostly expressionless, and she almost never smiles,[ch. 14,15] but she loves when Tomoki pats her on the head. She is also the scariest angeloid because when she is angry, her expression remains the same.[ch. 43]
- Although Ikaros claims to be a "Pet-Class" Angeloid designed for entertainment purposes, she is actually a "Strategic Battle-Class" Angeloid.[ch. 10] She absorbs little physical damage, flies up to Mach 24, and withstands water pressure deeper than most submarines.[ch. 4-6] As the Uranus Queen (空の女王（ウラヌス・クイーン） Uranusu Kuīn ), Ikaros is originally sent to Earth as a weapon of judgement to destroy the Tower of Babel.[ch. 10] When Ikaros enters "Battle Mode", her wings are engulfed in bright light, her eyes become red, and a halo appears over her head. Ikaros employs several types of weapons and armor: Aegis (イージス Ījisu ), an energy shield; Artemis (アルテミス Arutemisu ), a series of multi-directional homing energy projectiles fired from her wings; and Apollon (アポロン Aporon ), a bow that can fire an energy-charged arrow of mass destruction.[ch. 10,15] In the anime, she also uses a structure that resembles a spaceship called the Uranus System (ウラヌスシステム Uranusu Shisutemu ) equipped with Hephaestus (ヘーパイストス Hēpaisutosu ) cannons. In the manga, during a battle with Melan angeloid clones, Ikaros evolves into Ikaros Version II (イカロス バージョンⅡ Ikarosu Bājon Tsū ), where she gains "Dual Variable Wings", and her combat strength is doubled.[ch. 55,56]
- Ikaros has a fondness for watermelons and usually holds one or associates objects and people with one.[ch. 8] She also likes baby chickens.[ch. 15] Ikaros's name comes from the Greek mythological character Icarus, whose fate (falling from the sky) can be related to her introduction into the storyline.
- Sohara Mitsuki (見月 そはら Mitsuki Sohara )
- Voiced by: Mina (Japanese), Trina Nishimura (English)
- Sohara is Tomoki's childhood friend and next door neighbor who often goes to his house in the morning to wake him up.[ch. 1,7] She gets annoyed whenever Tomoki acts lecherous, and regularly punishes him with karate chops.[ch. 1] As a child, she was constantly ill and thus has few friends besides Tomoki. Despite all the punishment she dishes out to him,she secretly loves Tomoki.[vol. 6:EX-1] After the Angeloids arrive, Sohara helps them become accustomed to Earth life, but acts a bit jealous that Tomoki spends so much time with them. She also apparently has dreams that involve her and Tomoki in provocative situations; this suggests she does not mind his lechery IF it is directed only towards herself.[ch. 18]. She is apparently good at athletic activities,[ch. 19,23] but struggles with English[ch. 12,26] and is a terrible cook when it comes to sunny side up eggs.[ch. 41,51]
- Eishiro Sugata (守形 英四郎 Sugata Eishirō )
- Voiced by: Tatsuhisa Suzuki (Japanese), Eric Vale (English)
- Sugata is the leader of the New World Discovery Club (新大陸発見部 Shin Tairiku Hakkenbu ) at Tomoki's school.[note 7] In the anime, Sugata usually opens the episodes with some philosophical narrations which reference historical explorers such as Magellan and Columbus.[note 8] He is an eccentric scientist of sorts and visits Synapse by using Nymph's Dive Game portal. He lives in a tent by a river and is usually seen in his school uniform.[ch. 5][note 9] Because of his camping lifestyle, he usually eats what he can forage and hunt in the wild, where he fishes and fights off bears.[ch. 8]
- Sugata appears to be old friends with Mikako Satsukitane, who refers to him as "Ei-kun", and whose servants call him master.[ch. 8,26] He behaves in a generally deadpan manner unless it involves the "New World",[ch. 11,50] or if it threatens to reveal his family background.[ch. 58,59]
- Mikako Satsukitane (五月田根 美香子 Satsukitane Mikako )
- Voiced by: Ayahi Takagaki (Japanese), Jamie Marchi (English)
- Mikako is an upperclassman to Tomoki and Mitsuki and the President of the Student Council. She is a childhood friend of Sugata, whom she refers to as "Ei-kun", and is the daughter of an influential Yakuza boss in Sorami.[ch. 8] She is manipulative, cunning, highly intelligent, athletic,[note 10] and somewhat sadistic.[note 11] She initiates many schemes in the manga, usually in the form of festival competitions that place Tomoki in humiliating situations for her pleasure. However, she can be thoughtful at times: when Tomoki breaks his contract with Ikaros, Mikako mends the situation by ordering Ikaros to throw Tomoki into the ocean.[ch. 45]
- Mikako does not have a romantic interest in Tomoki; she directs her affections towards Sugata. In the last episode of the second anime season, Mikako tells Tomoki to choose a bride, she appears in a wedding dress and wraps her arm around Sugata's and says she is already taken. In the manga, she gets enraged when Tomoki's mother flirts with Sugata, and takes her wrath out on Tomoki.[ch. 49]
- Nymph (ニンフ Ninfu )
- Voiced by: Iori Nomizu (Japanese), Kara Edwards (English)
- Nymph is an "Electronic Warfare Angeloid, Type Beta" (電子戦用エンジェロイドタイプβ（ベータ）). She is introduced when she finds Ikaros on an errand and attacks her[ch. 9], then later mysteriously appears in Tomoki's living room where she casually snacks on chips.[ch. 13][note 13] She has a condescending attitude towards humans, whom she refers to as "bugs", and she calls Angeloids by their types rather than their names, for example, she calls Ikaros "Alpha".[ch. 10,13] Despite the attitude, she starts enjoying everyday life and her favorite hobby is eating snacks and watching soap operas.[ch. 20]
- Nymph's original mission is to retrieve Ikaros and return her to Synapse, however, she is physically weaker and fails to the mission after awakening Ikaros's Uranus Queen ability,[ch. 10] and is consequently heavily punished and abused.[ch. 12,13][note 14] After spending time with Tomoki and his friends, she begins to like humans, and soon develops feelings for Tomoki, albeit in an aloof fashion),[ch. 13,16,20] Nymph eventually betrays Synapse: in the manga she tries to surprise attack the Harpies, while in the anime she sides with Ikaros. In both cases, her wings are consequently ripped apart by the Harpies, but Tomoki and friends manage to free her link to her master.[ch. 15] The wings regenerate when she accepts Tomoki as her new master.[ch. 31] However, after the regrowth, Nymph needs to go through the Imprinting process required for her master;[ch. 34] she eventually asks Tomoki, but he refuses and states that he wants her to live freely.[ch. 39]
- As an Electronic Warfare-type Angeloid, Nymph's allocation of abilities emphasize her high processing capabilities and high emotional control, but her raw battle power is set low.[ch. 22] Nymph is able to hack computer systems as well as other Angeloids[ch. 10] and even humans.[ch. 25,27] She uses a device called the Dive Game which enables humans to enter each other's dreams and through Tomoki's dream, visit Synapse.[ch. 18] Her "Stealth" wings appear sheer, unlike Ikaros's wings which can only retract to stubs, and she can use this as a radar.[ch. 13,4][note 15] She can also fire a high-powered energy beam from her mouth called "Paradise Song" (パラダイスソング Paradaisu Songu ).[ch. 15] During the battle with Angeloid Hiyori, Tomoki's encouragement allows her to upgrade her powers to Aphrodite (アフロディーテ Afurodīte ), a "fundamental particle-jamming system" that she uses to hack and free Hiyori.[ch. 40][note 16]
- Nymph is named and modeled after the nature spirits of Greek myth.
- Astraea (アストレア Asutorea )
- Voiced by: Kaori Fukuhara (Japanese), Carli Mosier (English)
- Astraea is a very large-chested "Close-Combat Angeloid, Type Delta" (地戦闘用エンジェロイドタイプΔ（デルタ）) sent by Synapse to kill Tomoki. She is strong in combat and emotion compared to Ikaros, but because of that allocation, her weakness is her low processing power, and the other Angeloids consider her an idiot; this is affirmed when she bungles her multilple chances to kill Tomoki at the Buddhist temple, and later at the quiz show where she fails basic questions such as "what is 1+1".[ch. 22,26]. She is often famished because she does not know how to hunt or to obtain food by her own means; in one episode, she eats Sugata's fish bait.[ch. 28]. After spending time with Tomoki, she refuses Master's order to kill Nymph, and severs her own chain.[ch. 30-31]
- Astraea has a good relationship with her senpai sisters. Astraea eventually realizes that she too has fallen in love with Tomoki, Chaos questions her on the definition of love.[ch. 30,31,48] In recent chapters, she becomes depressed from losing her weapon and shield, but is encouraged by Tomoki who tells her only she can decide whether or not she is useless. She then decides to rescue her younger sister, Chaos.[ch. 60]
- According to Daedalus, Astraea is extremely quick and has great close-combat capabilities but is vulnerable to long-range attacks. She wields a super-osciliating photon blade called Chrysaor (クリサオル Kurisaoru ), which can even penetrate Ikaros's Aegis defense system. For defense, she uses Aegis L (イージス L Ījisu Eru , "L" stands for "left", as it appears on her left arm), a shield that is more powerful than Ikaros's version, but guards a limited angle and can only be deployed for a short period.[ch. 31] However, in her fight with Ikaros Melan, Astraea's sword and shield are destroyed.[ch. 56,60]
- Astraea is named after the Greek mythological figure Astraea, who was a goddess of justice that later became the constellations Virgo and Libra.
- Hiyori Kazane (風音 日和 Kazane Hiyori )
- Voiced by: Yōko Hikasa (Japanese), Colleen Clinkenbeard (English)
- Hiyori is a second-year student at Tomoki's school whose story is detailed in Heaven's Lost Property the Movie: The Angeloid of Clockwork. She has feelings for Tomoki and joins the New World Discovery Club in order to get closer to him.[ch. 34] In reality, Hiyori is an Angel who was first seen inside some sort of sleeping chamber when Sugata went to Synapse. The chamber connects her to her body on Earth, which functions like an avatar.[ch. 24] Sugata is hesitant on letting her join his club, but welcomes her anyway upon hearing the club would receive more funding. Tomoki puts Hiyori through an false initiation to assess her purity, but she innocently participates in. Thus far, only Sugata, Nymph, and Ikaros are aware of Hiyori's true identity.[ch. 35,38]
- Hiyori gets rather embarrassed when it is suggested that she and Tomoki are an item; while she likes Tomoki, she has not considered dating him yet, and her presence becomes a source of major discomfort for Sohara, Nymph, and Astraea. This stems from the realization that Hiyori is always kind and caring to Tomoki, while the others seem to only see his "faults".[ch. 36] Eventually, Hiyori manages to confess her feelings to Tomoki, which leaves him in shock as no girl has ever confessed to him before. However, her time with Tomoki was ultimately cut short when a sleepy truck driver ran her over, which causes her body to disappear and her existence erased from everyone's memories (except the Angeloids and Tomoki).[ch. 36-38]
- Hiyori is later converted to a "Type Zeta" Angeloid that works for the Master of Synapse to destroy the city. She uses a staff, called Demeter (デメテル Demeteru ), which has the power to manipulate the weather by lowering the air pressure, and thus knocking people unconscious. She is also able to counter-hack Nymph, but eventually loses when Nymph evolves into Aphrodite mode. After she is freed from Master, Hiyori remains on Earth and quits the New World Discovery Club. As she has accomplished her goal of getting close to Tomoki, she leaves him with a farewell kiss,[ch. 40] although she continues to harbor feelings for Tomoki.[ch. 61] She sacrifices herself so that Chaos can fully grasp emotions.[ch. 70]
- Daedalus (ダイダロス Daidarosu )
- Voiced by: Asuka Ōgame (Japanese), Monica Rial (English)
- Daedalus is an angel that frequently appears in Tomoki's dreams, but she flies away, which makes Tomoki cry. She comes to his dreams and asks him to help save her. It appears that she greatly cares for Tomoki. Her name originates from the Greek mythological character Daedalus, the father of Icarus, and her face is obscured in all of her appearances.[ch. 1,18] It is later revealed she is the creator of the first generation of Angeloids: Ikaros, Nymph, the Harpies, and Astarea.[ch. 26] She helps Sugata when he visits Synapse.[ch. 29,30]
- Master of Synapse (空(シナプス)のマスター Shinapusu no Masutā )
- Voiced by: Shinichiro Miki (Japanese), Mike McFarland (English)
- The sadistic and ruthless ruler of Synapse, Master enjoys torturing the Angeloids he owns (both physically and emotionally); he sees them as merely his playthings which he can do as he pleases, and discard as trash. He is condescending towards humans, and refers to them as "Downers", a trait that is also shared with his Angeloids. Because of his arrogance and belief that the Angeloids will always obey his orders, he is surprised when he witnesses one of them break their chain or go against his orders. He is usually seated at a throne with two Angeloids beside him. Like Daedalus, his face is mostly obscured in his appearances.[ch. 12-15] He also creates an "Ultimate Air Defense System" called Zeus (ゼウス Zeusu ).[ch. 47] His real name is Minos (ミノス Minosu ).[ch. 68]
- Harpies (ハーピー Hāpī )
- Voiced by: Michiko Neya (Harpy 1), Maya Okamoto (Harpy 2) (Japanese), Clarine Harp (Harpy), Stephanie Young (Gamma)[note 18] (English)
- Type: Gamma, Height: 166 cm (5 ft 5 in), Weight: 51 kg (112 lb), Wing Type: Not Variable, High-Altitude[ch. 62]
- A pair of "Interceptor Angeloids, Type Gamma" (要撃用エンジェロイドタイプγ), who answer directly to the Master of Synapse. They are responsible for tearing off Nymph's wings[ch. 15] and are also guards at Synapse's lab.[ch. 18,26,29] They are equipped with a "High-Fever Object Compression Anti-Aircraft Gun" on their left arm called Prometheus (プロメテウス Purometeusu ), which fires white-hot projectiles of 3,000 °C (5,430 °F) at 4 kilometres per second (8,900 mph),[ch. 15] and a "Super Vibration Claw" called Nemea (ネメア) mounted on their right arm.[ch. 62] They are named and modeled after the harpies of Greek mythology. After Master orders them to attack Ikaros for his amusement, but they are interrupted by Tomoki, who tells them to dress up; the younger is embarrassed, but the older plays along until they get to a bikini where she becomes extremely conscious about showing her belly button that she flees.[ch. 62] Later at the beach, the older harpy discovers she cannot survive being underwater, but was rescued by Tomoki and friends.[ch. 63] After she and Tomoki were stranded in a desert[ch. 64], the older harpy develops feelings for him and questions her mission.[ch. 64] The younger harpy decides to continue the mission; she fights Ikaros on her own, until the older harpy rejoins her.[ch. 65,66] They eventually force themselves inside Ikaros's Aegis shield and self-destruct by detonating their collars.[ch. 66] This causes the Master of Synapse great distress,[ch. 66] and causes Tomoki to lock himself in his room in depression.[ch. 67]
- Chaos (カオス Kaosu )
- Voiced by: Aki Toyosaki (Japanese), Carrie Savage (English)
- Type: Epsilon, Height: 107 cm (3 ft 6 in), Weight: 19 kg (42 lb)[ch. 31]
- Chaos is a "Second-Generation Angeloid, Type Epsilon" (第二世代エンジェロイドタイプε Dainisedai Enjeroido, Taipu Epushiron ) and a major antagonist of the series. She initially appears to Tomoki as a girl in a nun's outfit.[ch. 28] Chaos can change her appearance to mimic someone dear to her victim in order to instill turmoil and confusion (as her name implies), as she did against Nymph (and Ikaros) by taking on the likeness of Tomoki.[ch. 29] Her "wings" are a wicked array of bladed, almost organic-like appendages. Unlike the first generation Angeloids who lack the ability to sleep, Chaos can enter another person's dream, as she has initially done with Tomoki. Chaos has a strange obsession with love, often asking the person what love is, to which Ikaros responded that love, for her, was a sensation of pain in her reactor, obviously in a figurative sense.[ch. 31]
- Chaos's first mission is to retrieve Ikaros's core. She lures Nymph by deceptively posing as Tomoki and then orders her to kill herself.[ch. 29] She also fights and defeats the other first generation Angeloids, except for Ikaros who sends Chaos into an ocean chasm where she was temporarily incapacitated due to the great water pressure.[ch. 31] While there, she concludes that love equates to pain. Chaos was left in the abyss, where she dismembers and devours fish to "grow bigger" and "to show her 'love' to everyone". She easily devours Seiren, one of the Sky Master's Angeloids, and uses the Pandora program to evolve into Chaos Version 2.[ch. 45,47][note 19] She continues to question love by following Tomoki around a bit, but returns to her master only to be shot down by the Zeus cannon, and after overhearing Tomoki tell his Angeloids to go away, decides to return to the ocean floor to express her love more.[ch. 47] She later returns to devour the dark Angeloids; she acquires their powers, yet holds back from attacking Tomoki because of her feelings for him, and her desire to be accepted by him as a "good girl".[ch. 56] She returns to the ocean floor as Astraea looks for her.[ch. 56,60]
- In the Sora no Otoshimono: Forte anime, after Chaos is plunged into the sea, she emerges as an adult and fights Nymph and Astraea; she easily overpowers them, until Ikaros arrives. She was later defeated by Astraea and Ikaros, who use their upgraded weapons (courtesy of Nymph) and briefly shuts down, after which Tomoki installs on her chain a padlock device given to him by Daedalus, who then restores Chaos to her child form. Chaos then joins the cast as the newest resident of Tomoki's household.
- Oregano (オレガノ)
- Oregano, also known as "Mini-Ikaros" (ミニイカロス Mini-Ikarosu ), is one of the mass-produced Medical Specialist Angeloids (医療用エンジェロイドタイプ) from a village in Synapse who mysteriously manages to come to Earth by tagging along with Eishiro when he teleports back from one of his trips.[ch. 51] She seems to have common sense with Tomoki. Mikako takes her in afterwards (even giving her the ability to speak, a first since her Angeloid type are usually mute), as Tomoki does not have enough money to support another Angeloid. While Tomoki and Nymph are initially concerned that Mikako would abuse Oregano, they find her initially generally courteous and well-mannered, that is, until Tomoki leaves; then Oregano acts particularly vicious to Nymph by serving her vile food, insulting her, and trapping her in a cell full of ecchi animals (frogs licking, eels squirming) while dumping a bunch of grenades on her, all the while spinning the situations as if it were all Nymph's fault.[ch. 52] She later reveals that Nymph used to visit her village and forced everyone to listen to her horrible singing.[ch. 60]
- Seiren (セイレーン Seirēn )
- Seiren is an "Underwater Combat Angeloid, Type Eta" (水中戦闘用エンジェロイドタイプη（イータ）) built by the Master of Synapse who has a very brief appearance in the manga. She is ordered to kill Tomoki and Ikaros, but before she does anything, she is impaled in the back by one of Chaos' wings and then devoured by Chaos.[ch. 45] Her appearance is based on the sirens of Greek mythlology.
- Ikaros Melan (イカロス＝メラン Ikarosu Meran , Ίκαρος Μέλαν)
- Type: Theta, Height: 162 cm (5 ft 4 in), Weight: 48 kg (106 lb), Wing type: Variable [ch. 55]
- Ikaros Melan, or "Black Ikaros", is a "Tactical Angeloid, Type Theta" (戦略エンジェロイドタイプθ（シータ）) is introduced as a dark winged copy of Ikaros that possesses a Variable Wing core designed by the Master of Synapse. As a Second-Generation Angeloid, Ikaros Melan is stronger than her original: Astraea's Chrysaor breaks on her Aegis shield, and her counter-punch breaks Astraea's Aegis L shield. Ikaros Melan is eventually destroyed when the real Ikaros is hit with Ikaros Melan's Apollon arrow, after which Ikaros traps both in her Aegis shield just before the arrow explodes. She and the other dark Angeloids are then consumed by Chaos.[ch. 54-56]. However a Ikaros Malan was seen attacking Yoshitsune Hououin when he accidentally found himself in Synapse. [ch. 68]
- Tomozo Sakurai (桜井 智蔵 Sakurai Tomozō )
- Voiced by: Hiroshi Iwasaki (Japanese), Bill Flynn (English)
- Tomoki's equally perverted grandfather, whose dream was to sleep with every woman in the world, but could not do so before his death.[note 20] He usually appears when Tomoki is in a dire situation, usually as a flashback or some supernatural phonomena, to give him albeit perverted advice.[ch. 7,18,22,33] The manga features a recurring gag where Tomoki (and sometimes a friend) would be killed after doing something perverted; grandpa would meet them in the afterlife and tell them to "go home" (back to life).[ch. 27,41,58]
- Takehara (竹原)
- Voiced by: Takeshi Maruyama (Japanese), Sonny Strait (English)
- Tomoki's math teacher who serves as an announcer or commentator for the Satsukitane-sponsored sporting events and competitions in the series.[ch. 19,26]
- Zero (Judas)
- Voiced by: Jūrōta Kosugi (Japanese), Christopher Sabat (English)}
- A mysterious visitor who minds a pigeon-covered booth that bears the name JUDAS. He regularly appears during the Satsukitane festivals to foil any chances Tomoki has of winning the event; he usually overpowers him with his pair of pistols. He is directly based on the title character in the Judas manga that Minazuki worked on prior to this series.[ch. 19] In the manga, he is never mentioned by name, but in the anime he is credited by the name Zero.
- Tomoyo Sakurai (桜井 智代 Sakurai Tomoyo )
- Tomoki's mother, whose appearance resembles Tomoki's female alter ego, Tomoko, is just as perverted as her son. She inherited that characteristic from her father, Tomozo Sakurai. She and her husband left Tomoki on a "world tour" when he was only 10 years old, prior to the series' start. When she reunites with her son, she harasses Astraea and some of the other girls by fondling their breasts, and then flirts with Sugata, which enrages Mikako. She is finally stopped by her husband Tsutsumi, and then resumes her world tour with him.[ch. 49]
- Tsutsumi Sakurai (桜井 つつみ Sakurai Tsutsumi )
- Tomoki's father who briefly appears at the end of chapter 49 of the manga. He is very much like Sohara in that he packs a powerful karate chop that he uses on his wife for her pervertedness. Tsutsumi was actually married into the Sakurai family, while Tomoyo is the descendant of the Sakurai bloodline.[ch. 49]
- Yoshitsune Hououin (鳳凰院 義経 Hōōin Yoshitsune ) and Tsukino Hououin (鳳凰院 月乃 Hōōin Tsukino )
- Yoshitsune Voiced by: Shinji Kawada (Japanese), J. Michael Tatum (English)
- Tsukino Voiced by: Minako Kotobuki (Japanese), Cherami Leigh (English)
- Yoshitsune Hououin is the guy from the rival school that competes against Tomoki's school during the cultural festivals.[ch. 21,44] He comes from a wealthy family, although, in a public showdown against Mikako, his fortune cannot rival Mikako's "black money". Tsukino is his little sister who always looks up to him, that is, until Yoshitsune acts like a pervert by flipping a girl's skirt. Tomoki and friends try to help him reconcile with his sister while still acting like a man. He also notices that Sugata is hiding something about his past.[ch. 58]
- Synapse (シナプス Shinapusu )
- Synapse is a land located in the skies that is home to the Angels and the Angeloids. It was first introduced in the series as a black hole above Sorami. Sugata believes that Synapse is the "New World" and begins to investigate it. After discovering that Nymph's Dive Game is capable of providing a portal between Sorami and Synapse, Sugata asks Nymph to help him. In Synapse, there is a large dome that contains numerous Angels in sleeping pods, which connects them to their real-world avatars. If the avatar in the real world is killed, the people associated with them will have their memories erased, such as the case with Hiyori. Also in Synapse is a large obelisk called the Core, which has its rules written on it.[ch. 2,18,24]
- Angeloids (エンジェロイド Enjeroido )
- The Angeloids are a series of gynoids built by Synapse. As part of their name implies, they are modeled after the Angels and are programmed to serve their masters. The Angeloid selects her master through a process called "Imprinting", in which the chain attached to her neck collar extends to her chosen master's hand.[ch. 3] The first generation of Angeloids (Ikaros, Nymph, and Astraea) were built by Daedalus, while the second generation of Angeloids (Chaos, Hiyori, Seiren, and Ikaros Melan) have been built (or in Hiyori's case, converted to) by the Master of Synapse.
- Each Angeloid is designated with a letter of the Greek alphabet, which descends for every new Angeloid built. Ikaros, the first Angeloid built, is a "Type Alpha" Angeloid, while Ikaros Melan, the most recent Angeloid, is a "Type Theta" Angeloid. Each Angeloid has their own unique abilities and powers, which are determined from three main parameters: battle capability, emotional control and processing capability. Unlike humans and Angels, Angeloids cannot sleep or have dreams, except for Chaos.[note 21] The Angeloids are able to perform other human functions such as eating and expressing emotions. With the execption of Seiren (and consequently Chaos), Angeloids cannot swim because their wings absorb water, which causes them to sink, however, Ikaros is able to function underwater. The Angeloids' names, weapons, and abilities are primarily derived from Greek gods and mythological figures.
- Self-Evolution Program Pandora (自己進化プログラムパンドラ Jiko Shinka Puroguramu Pandora )
- A program built into certain Angeloids that allow them to learn and adapt to various environments and situations and eventually evolve into stronger beings with additional capabilities. Chaos is the first to demonstrate its ability when she absorbs Second-Generation Angeloid Seiren and grows amphibian wings to swim underwater. Daedalus later reveals that she built the Pandora program into her First-Generation Angeloids but added a protection layer so they would not evolve "by mistake". In chapter 55, Nymph is the first one to break the protection layer and evolve her Aprodite mode, and the end of the chapter, a severely damaged Ikaros, previously assumed irrepairable with 97% of her systems damaged and her self-repair program destroyed, also activates Pandora to evolve.[ch. 55-56]
In 2006, Suu Minazuki's previous manga Judas had ceased publication in Kadokawa Shoten's Shōnen Ace magazine with a total of five volumes. Minazuki had also wrapped up his fantasy harem comedy series Watashi no Messiah-sama in 2007, for which he started a sequel Watashi no Kyūseishu-sama ~lacrima~ which ran for 35 chapters in Monthly GFantasy in 2007-2008. These works were set in fantasy worlds with some references to Biblical characters and settings; Minazuki briefly alludes to the Tower of Babel in the history of the Angeloids.[ch. 10] Minazuki's Angeloid characters and weapons in Sora no Otoshimono are primarily named after characters in Greek mythology, including their classifications sequentially pulled from the Greek alphabet.
In 2008, Minazuki started a seinen water adventure series called Seven Ocean, but only six chapters were published. As the publication of Sora no Otoshimono was geared for a wider shōnen audience, Minazuki made some adjustments such as posting warnings to his readers to skip the chapter when it contains obvious nudity themes, and placing censor boxes and ovals over exposed body parts.[ch. 11,33]
Yoshihiro Watanabe, who worked on Brighter than the Dawning Blue and Bamboo Blade handled the Character Design and served as the Chief Animation Director for the first anime series. Hisashi Saito, who also directed Bamboo Blade, handled the Direction for the anime series as well as the OVA and the feature film.
Sora no Otoshimono began monthly serialization in the May 2007 issue of Shōnen Ace. The first tankōbon was released by Kadokawa Shoten on September 26, 2007, with a total of fifteen tankōbon released in Japan as of July 26, 2012.
In addition, a four-panel comic, titled Sora no Otoshimono Pico (そらのおとしものPICO Sora no Otoshimono Piko ), illustrated by ms, was developed and published in the inaugural issue of Kadokawa Shoten's 4-Koma Nano Ace magazine (published on March 9, 2011), and continued in Shōnen Ace until its conclusion on March 26, 2011. It focus the lives of Astraea, Nymph, and Ikaros.
|No.||Japanese release date||Japanese ISBN|
|01||September 26, 2007||ISBN 978-4-04-713973-2|
|02||December 26, 2007||ISBN 978-4-04-715013-3|
|03||July 26, 2008||ISBN 978-4-04-715079-9|
|04||January 26, 2009||ISBN 978-4-04-715164-2|
|05||April 25, 2009||ISBN 978-4-04-715228-1|
|06||September 26, 2009||ISBN 978-4-04-715292-2|
|07||October 26, 2009||ISBN 978-4-04-715301-1|
|08||March 26, 2010||ISBN 978-4-04-715399-8|
|09||September 9, 2010 (with DVD ed.)
September 25, 2010 (normal ed.)
|10||October 26, 2010||ISBN 978-4-04-715545-9|
|11||January 26, 2011||ISBN 978-4-04-715603-6|
|12||June 4, 2011||ISBN 978-4-04-715711-8|
|13||November 26, 2011||ISBN 978-4-04-120008-7|
|14||March 26, 2012||ISBN 978-4-04-120163-3|
|15||July 26, 2012||ISBN 978-4-04-120322-4|
|16||October 24, 2012||ISBN 978-4-04-120442-9|
|17||April 26, 2013||ISBN 978-4-04-120666-9|
Chapters not in tankōbon format 
- Chapter 70: Moral!
- Chapter 71: Expiation!!
An anime adaptation produced by AIC and directed by Hisashi Saitō aired in Japan between October 4, 2009 and December 27, 2009 on TV Saitama and Chiba TV, with subsequent broadcasts on KBS, tvk, Sun Television, TVQ, Tokyo MX and TV Aichi, with English-subtitled simulcasts provided on the Crunchyroll. Seven DVD compilation volumes were released between December 25, 2009 and June 25, 2010 by Kadokawa Pictures, with limited edition volumes also sold. A Blu-ray box set was released on June 24, 2011. An OVA episode entitled "Project Pink" was bundled with the limited edition release of volume 9 of the manga on DVD on September 9, 2010.
A second season, Sora no Otoshimono: Forte (そらのおとしもの（フォルテ）), was announced on reprinted copies of the manga, and aired 12 episodes between October 1 to December 17, 2010 with simulcasts provided by Crunchyroll, as with the first season. Six DVD volumes were released by Kadokawa Pictures between December 24, 2010 and May 27, 2011. A third season of Sora no Otoshimono has been announced.
The opening theme for the first season is "Ring My Bell", and for the second season, it is "Heart no Kakuritsu" (ハートの確率 Hāto no Kakuritsu , "Probabilities of the Heart"); both are performed by Blue Drops and feature singers Hitomi Yoshida and Ikaros (Saori Hayami). Both seasons also use different ending themes for each episode.
Both seasons of the anime are licensed in North America by Funimation Entertainment, which released them under the respective titles of Heaven's Lost Property and Heaven's Lost Property: Forte. The first season was released on December 20, 2011 on DVD and Blu-ray. However, due to concerns from the Japanese licensing company regarding Blu-ray sales, the second season was released only as a 2-disc DVD set in North America in March 20, 2012.
A film adaptation called Sora no Otoshimono the Movie: The Angeloid of Clockwork (劇場版 そらのおとしもの 時計じかけの哀女神（エンジェロイド） Gekijōban Sora no Otoshimono: Tokei-jikake no Enjeroido ) was announced by Kadokawa Shoten in November 2010. The film focuses on the Hiyori arc of the manga. A 30-second teaser trailer was shown in the post-end credits of the final episode of Forte. The film premiered in Japanese theaters on June 25, 2011. Funimation Entertainment licensed the film under the title of Heaven's Lost Property the Movie: The Angeloid of Clockwork, and released it on February 26, 2013.
Light novels 
A light novel adaptation of Sora no Otoshimono written by Rin Kazaki and illustrated by Minazuki was released by Kadokawa Shoten on February 1, 2010 under its Kadokawa Sneaker Bunko imprint. A sequel to the light novel called Sora no Otoshimono f, written by Rin Kanzaki and illustrated by Minazuki and Ayun Tachibana, was released on October 1, 2010.
Video games 
A video game developed by Kadokawa Shoten called Sora no Otoshimono: Heart-Throbbing Summer Vacation (そらのおとしもの ドキドキサマーバケーション Sora no Otoshimono Dokidoki Samā Bakēshon ) was released for the PlayStation Portable on March 25, 2010, featuring character interactions and mini-game puzzles.
Another game developed by Kadokawa Shoten called Sora no Otoshimono Forte: Dreamy Season (そらのおとしものf(フォルテ) Dreamy Season Sora no Otoshimono Forute Dorīmī Shīzun ) was released for the Nintendo DS on January 27, 2011, with gameplay of a visual novel plus some mildly sexually suggestive mini-games.
Tim Jones of T.H.E.M. Anime Reviews stated that the anime show "Dangles between the line of guilty pleasure and stupid, but manages to be an entertaining series all the same." and is actually funny in comparison to DearS, with "decent fanservice, amusing characters, and doesn't revolve entirely around subservient alien girls", however, he is critical of the tacked on fanservice, and dislikes Mikako's terrible character, "basically a two-faced bitch" whose smirks imply a "mean-spirited, unfunny joke coming out of her mouth." Chris Beveridge of Mania.com wrote that the second anime series "provides the kind of humor that's good to have once in awhile and certainly not what I want out of a lot of series, but the staff here has hit just about everything right (outside of that awful wrestling episode)." Theron Martin of Anime News Network wrote that the second series was sporadically enjoyable, with much of the attempts at humor and fanservice to be abysmally poor, although he enjoyed the English dub's voice work. Dennis Amith of J!-ENT considered the series "Intriguingly perverse, reminiscent of Urusei Yatsura and Chobits" and appealing to harem and fan service anime fans, but "enjoyed with every episode, the voice talent singing songs via anime theme songs from the ’70s, ’80′s and modern-style themes".
Following the anime episode ending that involved flying panties, Rocket Girls creator Hōsuke Nojiri created a rubber band powered ornithopter in the shape of the panties, and posted the video on Nico Nico Douga where it soon became viral. NKH (Niconico's live streaming station) and a local school (Niconico Technical Community) then hosted a Sora Fes event on March 6, 2010, where participants built and flew model airplanes in the likeness of the flying panties. Nojiri, along with OpenSky's media artist Kazuhiko Hachiya, director Hisashi Saito, and TBS announcer Jun Suzuki also attended the event.
With the broadcast of the Sora No Otoshimono Forte anime season, the January 2011 issue of Newtype featured Ikaros as the most popular female character, with Nymph at #7 and Astraea at #9. Tomoki Sakurai was also listed as #5 for most popular male character in that month. Streaming broadcaster Crunchyroll reported that Sora No Otoshimono Forte ranked #3 in popularity of their top 10 anime broadcasts in the Fall of 2010.
Several types of merchandise have been produced based primarily on the female characters of Sora no Otoshimono; they include: figurines, t-shirts, keychains, and body pillows. "Oppai" Mouse pads were also produced; the one of Ikaros became the subject of a bonus chapter.[vol. 10:extra]
- Tomoki is 14 years old when he goes on his first date with Ikaros and Nymph.[ch. 20]
- According to Astraea, Tomoki has dreamed this event for about 11 years, but it was not taken as a threat by Synapse until Tomoki and friends visited.[ch. 22]
- The manga features a recurring gag where the main characters gather at his house for fun, and whenever Tomoki is frustrated, he comically overturns his coffee table in anger, even doing so when there are no coffee tables, during which he materializes a "coffee table of the heart".[ch. 20,48]
- The Angeloids and other characters are occasionally presented super deformed in comical situations.
- Each of the cards is restricted to one type of wish such as making food, making money, or changing panties. Some are limited to single use.[ch. 2-4]
- In one instance, she became extremely depressed when Tomoki broke the imprinting between them and finds it difficult to express her feelings (Mikako notes that Ikaros has difficulty with expressing her emotions that concern Tomoki unless his life is in danger) until she was ordered to throw Tomoki into the ocean. This puts enough emotional stress on her that she tearfully begs Tomoki not to throw her away.[ch. 45]
- Sugata and Mikako are a year ahead of Tomoki and Sohara in middle school. In the chapter where Tomoki solicits Sugata's help to use a transformation card, Sugata is stated to be 15 years old.[ch. 11]
- Mikako assists Sugata with the narrations from the second half of season 1 to early in season 2, when she gets bored.
- In a chapter where they visit a water park, Sugata wears his school uniform and mentions he does not have any other clothes.[ch. 27]
- In a wrestling event, although Mikako is 164 cm (5 ft 5 in) tall and weighs 46 kg (101 lb), she is able to apply a hand grip of 400 kg (882 lb) on Sugata.[ch. 19]
- In one chapter, Mikako has to stay after school for supplementary lessons in Ethics.[ch. 26]
- In the wrestling episode, Nymph's measurements are billed as Height: 139 cm (4 ft 7 in), Weight: 29 kg (63.9 lb), Bust: 72 cm (28 in), Waist: 45 cm (18 in), Hip: 68 cm (27 in)
"A Proud-fought Battle!" (in Japanese). Heaven's Lost Property. Series 2. Episode 3. Event occurs at 13:03.
- In the anime, Nymph is introduced earlier in the storyline right before they go to the beach. She also participates in going to school and hangs out with Ikaros at the bath house.
- In the manga, Nymph also carries a timed explosive device so that regardless of the results of her mission, she would be destroyed. However it does not go off after she is freed.[ch. 12-16]
- Nymph's radar range is based on her wings; it weakens significantly during the time she is wingless.[vol. 6:chapter EX]
- When Nymph is in Aphrodite mode, her wings assume a butterfly shape. She also generates a lot of heat and requires cooling soon afterwards.[ch. 40]
- In the wrestling episode, Astraea's measurements are billed as Height: 159 cm (5 ft 3 in), Weight: 48 kg (106 lb), Bust: 91 cm (36 in), Waist: 56 cm (22 in), Hip: 86 cm (34 in)
"A Proud-fought Battle!" (in Japanese). Heaven's Lost Property. Series 2. Episode 3. Event occurs at 12:35.
- In the Funimation dub, one of the duo is named Harpy and the other is named Gamma.
- Chaos Version 2 weighs 20 kg (44 lb), Wing Type: Imperfect Variable, Amphibian. She is also equipped with an "Anti-Perception System" called Medusa and a "Super-High-Speed Atomic Vibration Generator" called Chimera.[ch. 47]
- On his deathbed, Tomoki's grandfather stated he still had 2,957,252,616 women to go.[ch. 18]
- Chaos may be an exception to the "no dreams" rule as she can enter people's dreams.
- Sora no Otoshimono manga volumes by Suu Minazuki. Original Japanese version published by Kadokawa Shoten.
- Vol. 1 (ch. 1–4): そらのおとしもの (1). September 26, 2007 ISBN 978-4-04-713973-2 (in Japanese).
- Vol. 2 (ch. 5–9): そらのおとしもの (2). December 26, 2007 ISBN 978-4-04-715013-3 (in Japanese).
- Vol. 3 (ch. 10–14): そらのおとしもの (3). July 26, 2008 ISBN 978-4-04-715079-9 (in Japanese).
- Vol. 4 (ch. 15–18): そらのおとしもの (4). January 26, 2009 ISBN 978-4-04-715164-2 (in Japanese).
- Vol. 5 (ch. 19–22): そらのおとしもの (5). April 25, 2009 ISBN 978-4-04-715228-1 (in Japanese).
- Vol. 6 (ch. 23–26): そらのおとしもの (6). September 26, 2009 ISBN 978-4-04-715292-2 (in Japanese).
- Vol. 7 (ch. 27–30): そらのおとしもの (7). October 26, 2009 ISBN 978-4-04-715301-1 (in Japanese).
- Vol. 8 (ch. 31–34): そらのおとしもの (8). March 26, 2010 ISBN 978-4-04-715399-8 (in Japanese).
- Vol. 9 (ch. 35–38): そらのおとしもの (9). September 9, 2010 ISBN 978-4-04-900800-5 (in Japanese).
- Vol. 10 (ch. 39–42): そらのおとしもの (10). October 26, 2010 ISBN 978-4-04-715545-9 (in Japanese).
- Vol. 11 (ch. 43–46): そらのおとしもの (11). January 26, 2011 ISBN 978-4-04-715603-6 (in Japanese).
- Vol. 12 (ch. 47–50): そらのおとしもの (12). June 4, 2011 ISBN 978-4-04-715711-8 (in Japanese).
- Vol. 13 (ch. 51–54): そらのおとしもの (13). November 26, 2011 ISBN 978-4-04-120008-7 (in Japanese).
- Vol. 14 (ch. 55–57): そらのおとしもの (14). March 26, 2012 ISBN 978-4-04-120163-3 (in Japanese).
- Vol. 15 (ch. 58–61): そらのおとしもの (15). July 26, 2012 ISBN 978-4-04-120322-4 (in Japanese).
- Vol. 16 (ch. 62–65): そらのおとしもの (16). October 26, 2012 ISBN 978-4-04-120442-9 (in Japanese).
Other sources 
- "Sora no Otoshimono Manga Has Anime in Development". Anime News Network. January 23, 2009. Retrieved January 24, 2009.
- "Sora no Otoshimono Film Trailer Streamed". Anime News Network. March 21, 2011. Retrieved March 22, 2011.
- "Sora no Otoshimono's 3rd Anime Season Listed". Anime News Network. January 22, 2012. Retrieved January 23, 2012.
- "Black Rock Shooter's 4-Panel Manga Launches This Week". Anime News Network. 2011-03-07.
- "そらのおとしもの (1)" (in Japanese). Kadokawa Shoten. Retrieved July 9, 2010.
- "そらのおとしもの (2)" (in Japanese). Kadokawa Shoten. Retrieved July 9, 2010.
- "そらのおとしもの (3)" (in Japanese). Kadokawa Shoten. Retrieved July 9, 2010.
- "そらのおとしもの (4)" (in Japanese). Kadokawa Shoten. Retrieved July 9, 2010.
- "そらのおとしもの (5)" (in Japanese). Kadokawa Shoten. Retrieved July 9, 2010.
- "そらのおとしもの (6)" (in Japanese). Kadokawa Shoten. Retrieved July 9, 2010.
- "そらのおとしもの (7)" (in Japanese). Kadokawa Shoten. Retrieved July 9, 2010.
- "そらのおとしもの (8)" (in Japanese). Kadokawa Shoten. Retrieved July 9, 2010.
- "そらのおとしもの (9) オリジナルアニメDVD付き限定版" (in Japanese). Kadokawa Shoten. Retrieved September 4, 2010.
- "そらのおとしもの (9)" (in Japanese). Kadokawa Shoten. Retrieved September 4, 2010.
- "そらのおとしもの (10)" (in Japanese). Kadokawa Shoten. Retrieved October 18, 2010.
- "そらのおとしもの (11)" (in Japanese). Kadokawa Shoten. Retrieved December 20, 2010.
- "そらのおとしもの (12)" (in Japanese). Kadokawa Shoten. Retrieved June 7, 2011.
- "そらのおとしもの (13)" (in Japanese). Kadokawa Shoten. Retrieved October 21, 2011.
- "そらのおとしもの (14)" (in Japanese). Kadokawa Shoten. Retrieved March 25, 2012.
- "そらのおとしもの (15)" (in Japanese). Kadokawa Shoten. Retrieved July 24, 2012.
- "そらのおとしもの (17)" (in Japanese). Kadokawa Shoten. Retrieved March 17, 2013.
- "Sora no Otoshimono DVD volumes" (in Japanese). Kadokawa Pictures. Retrieved June 7, 2011.
- "Sora no Otoshimono's 2nd TV Season Reportedly Green-Lit". Anime News Network. March 16, 2010. Retrieved March 22, 2010.
- "Crunchyroll Adds Heaven's Lost Property 2, Panty & Stocking, Fortune Arterial (Updated)". Anime News Network. September 15, 2010. Retrieved September 25, 2010.
- "Sora no Otoshimono: Forte DVD volumes" (in Japanese). Kadokawa Pictures. Retrieved June 7, 2011.
- "Funimation Adds Rosario + Vampire, Chaos;HEAd, Regios". Anime News Network. May 15, 2010. Retrieved May 15, 2010.
- "Funimations Adds Kuragehime, 2nd Heaven's Lost Property". Anime News Network. October 27, 2010. Retrieved October 27, 2010.
- "Funimation December 2011 releases". Janaiblog. Retrieved September 15, 2011.
- Saabedra, Humberto (2012-01-12). "Funimation Responds to Canceled Heaven's Lost Property Forte Blu-Ray". Crunchyroll.com.
- "Sora no Otoshimono: Forte Anime Film Green-Lit". Anime News Network. November 5, 2010. Retrieved November 6, 2010.
- "Heaven's Lost Property Movie DVD/Blu-Ray Combo (Hyb): Angeloid of Clockwork". The Right Stuf International. Retrieved December 27, 2012.
- "そらのおとしもの" (in Japanese). Kadokawa Shoten. Retrieved September 4, 2010.
- "そらのおとしものf" (in Japanese). Kadokawa Shoten. Retrieved September 4, 2010.
- "Sora no otoshimono Dokidoki Summer Vacation [PSP]". cdjapan.co.jp (in Japanese). Retrieved 2012-07-25.
- "そらのおとしものフォルテ Dreamy Season ｜ 2011年1月27日発売" (in Japanese). Kadokawa Shoten. Retrieved January 28, 2011.
- Jones, Tim. "Heaven's Lost Property". T.H.E.M. Anime Reviews. Retrieved 2012-07-24.
- Beveridge, Chris (2010-12-17). "Sora No Otoshimono Forte Episode #12". Mania.com.
- Martin, Theron (2012-07-13). "Heaven's Lost Property Forte DVD Review". Anime News Network.
- Amith, Dennis (2012-01-11). "Sora no Otoshimono: Heaven’s Lost Property – Season 1 (a J!-ENT Anime Blu-ray Disc Review)". J!-ENT.
- "Sora No Otoshimono Flying Panties Event Planned". Anime News Network. 2010-01-30.
- ""Sky Full of Flying Panties" became real, Video of Flying Session in Sora-Fes!". Gigazine.net. 2010-03-11. - translated from the Japanese article posted on March 8, 2010
- Newtype (in Japanese): 154. January 2011.
- "Crunchyroll Ranks Fall 2010 Simulcasts by Popularity". Anime News Network. 2010-10-12.
- "Complete releases of Sora no Otoshimono". cdjapan.co.jp (in Japan). Retrieved 2012-07-25.
- "Anime Mouse Pad Sora Otoshimono". amazon.com. Retrieved 2012-07-25.
- Official websites
- Heaven's Lost Property at Funimation
- Sora no Otoshimono at Anime Newtype Channel (Japanese)
- Sora no Otoshimono: Heart-Throbbing Summer Vacation (Japanese)
- Sora no Otoshimono Forte: Dreamy Season (Japanese)
- Additional websites