Karas (鴉－KARAS－, Karasu^?, lit. The Raven) is a six-part original video animation. Tatsunoko Production produced it to commemorate its 40th anniversary of anime production. Each Karas episode was first televised in Japan as a pay-per-view program from March 25, 2005, to August 3, 2007, before being released onto DVDs. Manga Entertainment compiled and released these episodes as two feature length, direct-to-DVD films for the English market.
Karas tells the story of Otoha, a former yakuza, living in a fictional version of Shinjuku, Tokyo populated by humans and yōkai (Japanese spirits). He is one of the titular karas, humans appointed as superpowered agents of the land. Able to transform into a car, an aircraft, and an armored crusader; the skilled swordsman is to stop his corrupt predecessor, Eko, from taking over Tokyo. Supporting characters such as Eko's former henchman, Nue; the yōkai; and Homura, the karas of another city, help Otoha in his quest. A concurrent side story focuses on humans affected by Eko's scheme.
Karas won the Best Original Video at the 2006 Tokyo Anime Award competition, and most reviewers were impressed with the images produced by fusing 2D and 3D art techniques. The story presents themes on the conflicts between cultural traditions and modern society, and the relationship between people. Reviewers, however, found its presentation was too confusing to follow; several of them felt it worsened the show by detracting from the strength of its art.