AI: The Somnium Files

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AI: The Somnium Files
AI The Somnium Files.png
Cover art, featuring (left to right) Aiba, Date and Iris in the center
Developer(s)Spike Chunsoft
Publisher(s)Spike Chunsoft[a]
Director(s)Kotaro Uchikoshi
Producer(s)Yasuhiro Iizuka
Designer(s)Akira Okada
Programmer(s)Yasushi Takashina
Artist(s)Yūsuke Kozaki
Writer(s)Kotaro Uchikoshi
Composer(s)Keisuke Ito
ReleaseNS, PS4, Windows
  • NA: September 17, 2019
  • JP: September 19, 2019
  • EU: September 20, 2019
Xbox One
  • WW: September 30, 2021

AI: The Somnium Files[b] (// (listen) EYE) is an adventure video game developed and published by Spike Chunsoft, which released for Nintendo Switch, PlayStation 4, and Windows on September 17 2019, and Xbox One on September 30, 2021. Set in Tokyo, the first installment in the franchise follows Special Agent Kaname Date, who investigates serial killings and enters suspects' memories to extract information to help solve them. The game was directed and written by Kotaro Uchikoshi, with character designs by Yūsuke Kozaki. A sequel, AI: The Somnium Files – Nirvana Initiative, was released in 2022.


AI: The Somnium Files is a mystery adventure game that has 2 areas of gameplay: investigation and somnium exploration.[2][3][4] The story progresses through branching paths leading to multiple different endings, based on choices the player makes;[5][6] the player only gets a full view of the story by playing through each route.[4] Rather than starting over from the beginning several times to see different paths, the player can skip directly to the branching points using an in-game flow chart.[6]

During the investigation, the player character, Special Agent Kaname Date, uses his artificial intelligence unit, Aiba, to assist Date while performing his duties. Her features include X-ray vision and zooming, to further the investigation in the real world. This part of the game takes place in a 2D, visual novel style format.[6][5][3][4]

During the somnium gameplay, Date uses a device called the Psync Machine[4] to enter the memories of suspects or key witnesses who do not want to share information with him, in the form of dreamscapes called the "Somnium", to find clues and extract the information by solving puzzles.[6][5][3][4] The puzzles involve examining objects and choosing an action to perform with it, as well as solving mental locks – obstacles standing in the way of clues – allowing the player to sink deeper into the character's subconscious. There is a six-minute time limit before the dreamscape collapses, and as actions take time to perform, the player must be careful in deciding what to do. Within the somnium gameplay, Aiba takes the form of a humanoid and acts as the player avatar, while being able to explore in a 3D environment.[4]



AI: The Somnium Files takes place in a technologically advanced near-future Tokyo, and follows Special Agent Kaname Date of the top-secret police department ABIS (Advanced Brain Investigation Squad). ABIS investigates crimes through a process called "Psyncing," in which a Psyncer such as Date explores the Somnium, or dream world, of persons of interest in a case. Psyncing is a powerful process that can often retrieve clues the subject is only subconsciously aware of, but it is limited to a maximum of six minutes for the Psyncer and subject's safety. Any further than 6 minutes can damage the brain of both the Psyncer and subject, resulting in death.

Date is assisted by an artificial intelligence (A.I.) housed in his cybernetic left eye named Aiba, who can communicate with Date via an artificial nerve, provide him with enhanced vision modes such as X-Ray and night vision, and hack various electronics. Aiba also assists Date's dream world investigations by acting as his avatar in Somnium.


Kaname Date, who lost his left eye and all his memories six years prior, is called to investigate the murder of Shoko Nadami, whose left eye was removed before her death. He finds her daughter Mizuki at the scene, unable to speak because of her trauma. Date investigates Mizuki's dream to find out what she witnessed, and the plot diverges based on the player's choices in her Somnium.

In the left branch of Mizuki's Somnium, Date finds evidence implicating Renju Okiura, Mizuki's father and Shoko's ex-husband, before discovering his body with the left eye missing. Boss, the head of ABIS, reveals that she suspects the killer to be a copycat of the Cyclops Serial Killings, an unsolved case from six years prior in which the victims' right eyes were removed posthumously. Date interrogates then Psyncs with net idol Iris Sagan, who was seen with her producer Renju the day before. The story diverges once more from Iris's Somnium.

In the left branch of Iris' Somnium, Iris's friend Ota knocks Date unconscious and escapes. Date awakens to a livestream of Iris's attempted murder, but traces the video source in time to save her. Date Psyncs with Ota to learn more. The left branch of Ota's Somnium leads to the Ota Route, in which the case remains unsolved, but Ota reconciles with his mother. The right branch of Ota's Somnium leads to the Mizuki Route, in which additional evidence implicates congressman So Sejima as Iris's would-be killer. A gunfight at the Sejima residence leaves So dead and Date comatose. Mizuki Psyncs with Date to save him, and the case is resolved.

In the right branch of Iris's Somnium, Date witnesses the Original Cyclops Serial Killings. Afterward, Iris's murder is livestreamed, and Date fails to arrive in time, resulting in Ota's death as well. Date learns that the original Cyclops Killers were a duo of a "murderous psychopath" who committed the murders. One of them was the yakuza chairman Rohan Kumakura, the other was currently imprisoned as "#89." Date interrogates #89, who tells the story of a detective-turned-assassin named Falco. Falco worked for the Kumakuras and tried to go clean after falling for Hitomi, Iris's mother. After Boss appears in #89's Somnium, Date searches for her. On her work computer he discovers a video of Boss shooting So Sejima with his left eye missing. The story then locks until the player completes other routes.

Back in the right branch of Mizuki's Somnium, Date sees a frozen corpse that looks like Iris. The following day, Date learns that Renju was involved in a car crash and ran from the hospital. During his search he witnesses So Sejima leaving a fishery warehouse, and discovers Iris's frozen body inside. Date Psyncs with So, in which he saves Iris's life. After the Somnium, he discovers Iris is alive, and wonders if he altered reality by saving her. Date attempts to interrogate #89, who escapes with Renju's help. Date takes Iris along to search for him, but the two are attacked by mercenaries and Iris reveals that she is being targeted by a secret organization. Date Psyncs with her to determine the truth.

After the left branch of Iris's Somnium, Date learns that Renju attempted to take her to an off-limits chemical plant. At the plant, Date finds a stolen prototype Psync Machine. Suddenly, Iris collapses, so Date attempts to save her by Psyncing, but fails. She dies in his arms, concluding the Iris Route. After the right branch of Iris's Somnium, Date doubts Iris and goes to Hitomi, who reveals that Iris has a malignant brain tumor causing her delusions. Iris goes missing, and Date eventually finds her body in the fishery warehouse. Aiba realizes the body is not Iris, and identifies it as Manaka Iwai, Hitomi and Renju's old classmate. Date learns from Hitomi that Manaka is Iris's birth mother, and she was killed 18 years ago by So Sejima's son Saito. Date also learns the truth of the Psync Machine: staying past the time limit causes the Psyncer and subject to swap bodies. Hitomi reveals she knows Iris's location, and takes Date to the chemical plant, where #89 knocks him out. The story locks, allowing the other locked route to be completed.

After watching Boss shoot So, Date finds and Psyncs with her. In her Somnium, he realizes that the murders were committed by one person using the prototype Psync Machine to swap bodies with each of the victims. Their eyes were removed because it was necessary for the machine to work. The killer, in Boss's body, identifies himself as Saito Sejima, and explains that the murders were revenge against Date for taking his body six years ago, Date's true identity is Falco, and #89 is Rohan in Falco's body. Saito threatens to kill Hitomi, who had been tied down with explosives in an unknown location, unless Date swap bodies with him. Date complies, but Saito's promise is broken when the explosives detonate after the bodyswap is complete, killing Hitomi. Aiba shocks Saito unconscious and Date blacks out, concluding the Annihilation Route.

In the final route, Date confronts Saito, who is now in #89/Falco's body having swapped with and killed Rohan. Saito forces them to switch bodies. In his original body, Date regains his memories and recalls how he attempted to save Iris and Hitomi from the yakuza by switching bodies with Rohan, but discovered the truth of the Cyclops Killings. Saito learned about Psyncing and used the prototype to swap bodies, but an accident caused both of them to lose their memories. In the present day, Saito prepares to kill Iris and Hitomi, but Iris's friends come to her rescue. With no other options to save Hitomi, Date activates Aiba's self-destruct function to kill Saito, seemingly also killing Aiba, whose backup data was deleted by rogue ABIS engineer Pewter. With the case resolved, the police pay for Iris's treatment, and three months later she has made a full recovery. Iris takes Date to the warehouse district where Aiba appears in augmented reality. It is revealed that Aiba survived by downloading and recompiling the fragments of her personality in the cloud, and that the Boss replaced Date's prosthetic eye with Aiba earlier that day. The cast of the game celebrates by dancing to Iris's song Invincible Rainbow Arrow, concluding the Resolution Route.


A 2016 photograph of Kotaro Uchikoshi
A 2019 photograph of Yūsuke Kozaki
The game was written and directed by Kotaro Uchikoshi (left), with character designs by Yūsuke Kozaki (right).

AI: The Somnium Files was developed by Spike Chunsoft,[7] and was written and directed by Kotaro Uchikoshi, produced by Yasuhiro Iizuka, designed by Akira Okada, and includes character designs by Yūsuke Kozaki and music by Keisuke Ito.[8][9][10][11] Kozaki was approached by Uchikoshi for his role as character designer due to being an internationally known artist, and how Uchikoshi wanted the art to have a worldwide appeal.[6] The game was developed with a higher budget than that of Uchikoshi's previous work, the Zero Escape series, which according to Uchikoshi helped allow him to express his concept for the game in a way that he was unable to with Zero Escape.[5] Comparing AI: The Somnium Files with Zero Escape, Uchikoshi described AI: The Somnium Files as being made more with adventure game fans in mind, in contrast to Zero Escape's heavy use of cutscenes. Ahead of the game's release, a similar system to Aiba, a "Borges A.I." system known as Kudan, was introduced in the light novel trilogy Danganronpa Togami (2015–2017); further Easter eggs throughout AI: The Somnium Files indicate it to be set in the same fictional universe as the Danganronpa series.[8]

Two of the game's core themes are eyes and "different types and expressions of love", reflected in how the title AI is pronounced "eye" and in how "ai" () is the Japanese word for love.[3][12] The title also has additional meanings in that it is pronounced like the English word "I" and is short for "artificial intelligence",[3][6] and the "Somnium" in the subtitle is taken from the Latin word for "dream".[3] The idea of entering characters' dreams to solve cases was proposed by Iizuka. Uchikoshi thought it was intriguing, so he decided to use it in the game.[10] The game's investigation-based puzzles are intentionally designed to be less difficult than those in the Zero Escape series,[10] and are described by Uchikoshi as a modern take on the style of Hideo Kojima's 1994 adventure game Policenauts.[5] Other influences on the game included EVE (1995) and The Silver Case (1999); Okada additionally mentioned Life Is Strange (2015), Detroit: Become Human (2018), Heavy Rain (2010) and The Walking Dead (2012–2019) as influencing his work on the game.[13]

The game was first teased at a Game Developers Conference 2017 press event under the working title Project Psync,[7] with a piece of artwork depicting an eye.[2] Spike Chunsoft announced the game the following year during an Anime Expo 2018 panel, and released a first teaser trailer introducing Date.[3][14] In January 2019, Spike Chunsoft started promoting the game with a YouTube and Twitter account for the character Iris.[15]

The game was released in North America on September 17, 2019, in Japan on September 19, and in Europe on September 20[16] for Nintendo Switch, PlayStation 4, and Windows with both English and Japanese audio. In addition to the standard edition, a "Special Agent Edition" was also released, which included an artbook, the game's soundtrack, an Iris acrylic stand, a set of stickers, and a game box.[8] Due to manufacturing delays and increased demand, the North American physical release was delayed until September 24, 2019.[17] An Xbox One version was announced during Tokyo Game Show on September 30, 2021. It was released digitally on the same day, and is available to Xbox Game Pass subscribers.[18]


AI: The Somnium Files received generally positive reviews, according to review aggregator Metacritic,[19][20] and was the 12th best reviewed Nintendo Switch game of the year.[26] Reviewers generally praised the plot and strong writing to the game; they noted it was simultaneously cerebral and thought-provoking while remaining accessible and understandable.[24][27] The voice acting was also considered "superb", with the actors bringing life to the characters.[28] The dream sequences were also praised as creative and inventive.[24] The art and character designs received approval as well.[29] There was also some light criticism of certain "sleazy" jokes as being not particularly funny and painting Date as less sympathetic and more of an "oaf" than he was presumably intended to be.[28][27]

In Japan, the game failed to chart in the Media Create top 10 and Famitsu top 30 in its release week.[30] The PlayStation 4 version ranked 27th with 2,267 copies sold, while the Nintendo Switch version was 33rd with 1,767 copies sold in the Dengeki top 50.[31] The PC version of the game was among the best-selling new releases of the month on Steam.[32][c]

The game was nominated for "Best Adventure Game" at the Famitsu Dengeki Game Awards 2019.[34]


A sequel, AI: The Somnium Files – Nirvana Initiative, was released in June 2022 for Microsoft Windows, Nintendo Switch, PlayStation 4 and Xbox One. Uchikoshi returned to write it, while the first game's designer and assistant director Akira Okada took over as director.[35]


  1. ^ Physical versions published by Numskull Games in Europe[1]
  2. ^ Known in Japan as AI: Somnium File (AI:ソムニウム ファイル, Ai: Somuniumu Fairu)
  3. ^ Based on total revenue for the first two weeks on sale.[33]


  1. ^ Lada, Jenni (June 25, 2019). "Numskull Games Is Handling The Australian And European AI: The Somnium Files And Crystar Physical Copies". Siliconera. Retrieved September 30, 2021.
  2. ^ a b Wales, Matt (July 6, 2018). "Zero Escape director reveals new murder mystery adventure AI: The Somnium Files". Eurogamer. Gamer Network. Archived from the original on July 6, 2018. Retrieved July 8, 2018.
  3. ^ a b c d e f g Romano, Sal (July 5, 2018). "Kotaro Uchikoshi announces AI: The Somnium Files for PS4, Switch, and PC". Gematsu. Archived from the original on July 8, 2018. Retrieved July 8, 2018.
  4. ^ a b c d e f Romano, Sal (April 12, 2019). "AI: The Somnium Files details Somnium Parts, ABIS members". Gematsu. Archived from the original on April 12, 2019. Retrieved April 13, 2019.
  5. ^ a b c d e Galizio, James (July 16, 2018). "AI: The Somnium Files Interview - A Look Behind the Scenes with Kotaro Uchikoshi". RPG Site. UFF Network. Archived from the original on July 19, 2018. Retrieved July 19, 2018.
  6. ^ a b c d e f YamaChan (March 22, 2019). "[GDC 2019]CERO Zの推理ADV,「AI:ソムニウム ファイル」には,打越鋼太郎氏の全力が盛り込まれている". (in Japanese). Aetas Inc. Archived from the original on March 23, 2019. Retrieved March 26, 2019. Translation Archived March 26, 2019, at the Wayback Machine.
  7. ^ a b Allegra, Frank (March 2, 2017). "Zero Escape director teases next project". Polygon. Vox Media. Archived from the original on March 3, 2017. Retrieved March 3, 2017.
  8. ^ a b c Romano, Sal (March 21, 2019). "AI: The Somnium Files launches July 25; interview with director Kotaro Uchikoshi and designer Akira Okada". Gematsu. Archived from the original on March 22, 2019. Retrieved March 22, 2019.
  9. ^ Shigeta, Yuichi (July 6, 2018). "打越鋼太郎が手掛ける本格推理ADV『AI:ソムニウム ファイル』がPS4/Switch/PC向けに発表!". IGN (in Japanese). Ziff Davis. Archived from the original on July 6, 2018. Retrieved July 6, 2018.
  10. ^ a b c Allen, Robert (July 8, 2018). "Q&A With AI: The Somnium Files' Kōtarō Uchikoshi". Tech-Gaming. Archived from the original on July 14, 2018. Retrieved July 14, 2018.
  11. ^ Uchikoshi, Kotaro (March 24, 2019). "Keisuke Ito. He made super hyper great amazing musics for AI!! Look forward to that!!". Archived from the original on March 25, 2019. Retrieved March 25, 2019 – via Twitter.
  12. ^ O'Connor, Alice (July 6, 2018). "Zero Escape director reveals AI: The Somnium Files". Rock, Paper, Shotgun. Archived from the original on July 6, 2018. Retrieved July 8, 2018.
  13. ^ Snyder, Gabby (March 21, 2019). "A.I. The Somnium Files Interview with Mr. Kotaro Uchikoshi and Mr. Akira Okada—Where, oh where, has A-Set gone?". Archived from the original on March 22, 2019. Retrieved March 22, 2019 – via Medium.
  14. ^ Frank, Allegra (July 6, 2018). "Zero Escape creator's next game is a mysterious detective story". Polygon. Vox Media. Archived from the original on July 7, 2018. Retrieved July 8, 2018.
  15. ^ Higham, Michael (January 30, 2019). "Zero Escape Director Reveals Virtual Pop Idol From Upcoming Game". GameSpot. CBS Interactive. Archived from the original on January 31, 2019. Retrieved February 3, 2019.
  16. ^ Romano, Sal (May 17, 2019). "AI: The Somnium Files launches September 20 in Europe". Gematsu. Archived from the original on May 17, 2019. Retrieved May 17, 2019.
  17. ^ Pineda, Rafael Antonio (September 6, 2019). "AI: The Somnium Files Game's N. American Physical Release Delayed to September 24". Anime News Network. Archived from the original on November 2, 2019. Retrieved September 8, 2019.
  18. ^ Tolentino, Josh (September 30, 2021). "AI: The Somnium Files and Scarlet Nexus Join Xbox Game Pass". Siliconera. Retrieved September 30, 2021.
  19. ^ a b "AI: The Somnium Files for Switch Reviews". Metacritic. Red Ventures. Archived from the original on October 19, 2019. Retrieved October 5, 2019.
  20. ^ a b "AI: The Somnium Files for PlayStation 4 Reviews". Metacritic. Red Ventures. Retrieved June 13, 2022.
  21. ^ "Famitsu's The Legend of Zelda: Link's Awakening Review Score Is In". Nintendo Insider. September 11, 2019. Retrieved September 14, 2019.
  22. ^ "AI: The Somnium Files Review - Eye Love You". Gamespot. September 13, 2019. Retrieved September 14, 2019.
  23. ^ Swalley, Kirstin (September 24, 2019). "Review: AI: The Somnium Files". Hardcore Gamer. Archived from the original on September 27, 2019. Retrieved October 27, 2019.
  24. ^ a b c "AI: The Somnium Files Review (Switch)". Nintendo Life. September 12, 2019. Archived from the original on September 13, 2019. Retrieved September 14, 2019.
  25. ^ Theriault, Donald (September 12, 2019). "Ai: The Somnium Files (Switch) Review". Nintendo World Report. Archived from the original on September 13, 2019. Retrieved September 17, 2019.
  26. ^ Dietz, Jason (January 3, 2020). "The Best Videogames of 2019". Metacritic. CBS Interactive. Archived from the original on February 19, 2020. Retrieved March 19, 2020.
  27. ^ a b AI: The Somnium Files review Archived November 18, 2019, at the Wayback Machine, TechGaming
  28. ^ a b "AI: The Somnium Files review - a bizarre story, masterfully told". Eurogamer. September 17, 2019. Archived from the original on November 18, 2019. Retrieved November 23, 2019.
  29. ^ Review: AI: THE SOMNIUM FILES Archived November 18, 2019, at the Wayback Machine, Japanator
  30. ^ "[Japan] Famitsu sales for Week 38, 2019 (September 16th – 22nd) [Top 30]". Perfectly Nintendo. September 27, 2019. Archived from the original on December 7, 2019. Retrieved February 11, 2020.
  31. ^ "【週間ソフト販売ランキング TOP50】『ゼルダの伝説 夢をみる島』が13.2万本(9月16日~22日)". Dengeki Bunko (in Japanese). ASCII Media Works. September 26, 2019. Archived from the original on December 7, 2019. Retrieved February 11, 2020.
  32. ^ "Best of 2019: New Releases". Steam. Valve. December 26, 2019. Archived from the original on December 28, 2019. Retrieved December 28, 2019.
  33. ^ "A Look Back - The Best of 2019". Steam. Valve. December 26, 2019. Archived from the original on December 28, 2019. Retrieved December 28, 2019.
  34. ^ Sato (April 18, 2020). "Here Are the Winners of the Famitsu Dengeki Game Awards 2019". Siliconera. Archived from the original on November 20, 2020. Retrieved May 4, 2020.
  35. ^ "新作『アイ:ソムニウムファイル ニルヴァーナ イニシアチブ』2022年春発売決定。打越鋼太郎氏の推理アドベンチャーの続編が登場". Famitsu (in Japanese). Kadokawa Game Linkage. July 1, 2021. Archived from the original on July 1, 2021. Retrieved July 1, 2021.

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