Gate 7(ゲート セブン,Gēto Sebun?) is a Japanese manga series written and illustrated by the manga artist group Clamp. It was originally published as a one-shot in December 2010, and later began serialization in the March 2011 issue of Shueisha's Jump Square magazine. It concerns a young student who visits a shrine in Kyoto and meets a beautiful childlike female-looking warrior who invites him to fight supernatural enemies. The manga is licensed in English in North America by Dark Horse Comics.
Gate 7 follows Chikahito Takamoto, a secondary school student whose strong interest in history brings him to Kyoto, where he meets a beautiful childlike warrior named Hana, who fights supernatural enemies with the aid of Tachibana and Sakura, two young men with magical powers of their own. The trio of Hana, Tachibana, and Sakura are members of the Urashichiken Hanamachi, a secret society dedicated to waging battle against otherworldly creatures that appear in Kyoto.
As Chikahito soon learns, the Urashichiken's battles go back to the Sengoku era in Japan, when warlords and other key figures attempted to defeat their rivals by forming blood contracts with powerful spiritual beings known as Oni. Since then, many of masters of the Oni have reincarnated in the present, with the Urashichiken's current leader being the reincarnation of Toyotomi Hidetsugu, and they struggle to find the long-missing body of Oda Nobunaga in order to obtain the most powerful Oni of all. Chikahito inexplicably finds himself in the midst of the otherworldly spaces where the battles are fought as he begins his new life in Kyoto.
A beautiful, childlike warrior, Hana wields special powers, helping her fight supernatural enemies. She invites Chikahito to live with her and the two men who accompany her, Tachibana and Sakura. In the beginning of the series, she kisses Chikahito upon meeting him, although it was revealed later by Sakura that she had actually cast a spell on him. When not in battle, Hana is a seemingly normal girl with a fondness for noodles. In truth, Hana is neither male, nor female. Little is actually known about Hana.
A shy, young boy in his second year of high school, Chikahito takes a sightseeing trip to ancient Kyoto, his dream being that he wishes to live there. While wandering in the grounds of the legendary Shinto shrines of Kitano Tenman-gū, Chikahito stumbles upon a mystical realm to find a beautiful young girl named Hana and her comrades, Tachibana and Sakura. His immunity to their powers reveals that he isn't the only ordinary one there. He is welcomed by Hana to live with her, Tachibana, and Sakura. Chikihito is a good cook, and is very knowledgeable of Kyoto and famous historical figures of Japan.
The mysterious, handsome, and often ruthless, Tachibana is a companion of Hana, and a university student. His name, Tachibana, means wild orange, the same kind of tree that is famous for being of the south side of the Kyoto Imperial Palace. Often acting like an older brother to Hana, he is protective of her and is often worried about her. He appears annoyed at the presence of Chikahito, addressing him as an "ordinary human" upon meeting him. Like Hana and Sakura, he fights the supernatural beasts by summoning elements. His motives for fighting for the Urashichiken are to save his twin sister, Princess Sugi (杉姫,Sugi-hime?), who was abducted by Iemitsu Tokugawa, the third shogun of the Tokugawa Dynasty. Tachibana has the ability to summon Yang weapons for Hana.
Another of Hana's companions and Tachibana's partner, Sakura is gentleman who also assists in fighting Hana and Tachibana's supernatural enemies. His name, Sakura, means cherry blossom, the tree that is famous for being on the south side of the Kyoto Imperial Palace. Like Tachibana, he cares a lot about Hana and her well being. He will often tease Chikahito, making Chikahito question Hana's gender. Though he teases him, he appears much more welcoming toward Chikahito than Tachibana. When in battle, Sakura is in charge of making the borders surrounding the dimension in which they fight in. In his every day life, he works as a male attendant for geiko and maiko. Sakura has the ability to summon Yin weapons for Hana.
The first reincarnation of a famous Japanese historical figure introduced, Hidetsugu appears to a calm person, who gets along quite well with people. He visits his own grave, and reveals his Oni, Mikoto.
The main antagonist who wants to locate the body of Oda Nobunaga and claim his Oni, which is believed to be the most powerful of all. Having the appearance of a young, androgynous boy with purple eyes, he approaches Chikahito and enrolls in his school under the name of Yuu Aoi. He has the habit of allowing his Oni to feed on humans.
An ally of the Urashichiken residents, his Oni, Kurikara, takes the shape of a sword stored inside the body of his companion Kojūrō. He dotes a lot on Hana and does not contain his love for her, much to the others' annoyance.