Onmyō Taisenki

Japanese multimedia franchise

(陰陽大戦記) is a Japanese mixed media project developed by ウィズ (玩具) and Bandai. A manga series, scripted by Yoshihiko Tomizawa and illustrated by Hiroyuki Kaidō, was serialized in Shueisha's V Jump magazine from November 2003 to December 2005, with its chapters collected in three tankōbon volumes. A 52 episode anime television series produced by Sunrise, NAS, and TV Tokyo, was broadcast from September 2004 to September 2005. Three video games were also released: one for Game Boy Advance in 2004 and two for the PlayStation 2 in 2005.

Riku Tachibana is a 12 year old boy who lives near Tokyo. Never having met his parents, he lives an ordinary life with his adoptive grandfather. His grandfather had taught him a series of strange hand movements, which Riku did not know the purpose of until the day his grandfather is attacked near his shrine. But it is not an ordinary attacker. The attacker is a (式神), strange monsters with human owners. Riku comes to the scene and that's where he first gets in contact with his Drive (神操機), the device he uses to call and make a 'contract' (契約) with Kogenta of the Byakko, his shikigami and, from that day on, best friend. The shikigami needs, for special attacks, a special series of Seal (印), one of which happens to be the strange hand movements Riku's grandfather always taught him. As Riku's grandfather decides to leave the house for a journey, the 10 year old boy Souma Asuka (飛鳥 ソーマ) and the 10 year old girl Nazuna (ナズナ) rent rooms in Riku's house. The 17 year old man, Masaomi, who teaches Riku the secrets of Onmyōdō (such as the use of Tōjinfu, for example), drops by eventually. The three of them have "contracts" with shikigami. The main events of the series are related to the menace of the Chi ryū (地流), a powerful Japanese financial group related to the Onmyōdō; attempting to open the four (四大天), and freeing Utsuho (ウツホ), a boy who was born with the power to control (妖怪), and had been imprisoned for thousands of years.

A manga series, written by Yoshihiko Tomizawa and illustrated by Hiroyuki Kaidō, was serialized in Shueisha's V Jump from November 19, 2003, to December 17, 2005. Shueisha collected its chapters in three tankōbon volumes, released from October 4, 2004, to March 3, 2006.

A 52 episode anime television series, produced by Sunrise, NAS, and TV Tokyo, was broadcast on TV Tokyo from September 30, 2004, to September 29, 2005.

(陰陽大戦記 零式') was released the Game Boy Advance on December 9, 2004. (陰陽大戦記 白虎演舞) was released for the PlayStation 2 on March 31, 2005; the game required the EyeToy accessory. (陰陽大戦記 覇者の印) was released for the PlayStation 2 on June 23, 2005.