Koroshiya 1 The Animation: Episode 0
English title: Ichi The Killer: Episode 0
Japanese title: 殺し屋１ THE ANIMATION EPISODE 0
Alternative titles: Koroshiya Ichi The Animation: Episode 0
Type: OVA
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Sep 27, 2002
Duration: 45 min
Rating: R+ - Mild Nudity
Studios: AIC
Producers: Amuse, Omnibus Promotion
Licensors: Central Park Media
Genres: Action, Avant Garde, Drama, Horror, Suspense
Themes: Gore, Martial Arts, Organized Crime, Psychological
Demographics: Seinen

A masochistic mobster meets his match in the dark streets of Tokyo. His nemesis, Ichi, is a psychopathic killer with an unrelenting thirst for bloodshed. A horrifying secret burns in his mind, and his hands deal death without mercy. At last, the shrouds of mystery are parted to reveal the origin of the monster. The city will know its greatest fear at the unveiling of Ichi the Killer. 

(Source: ANN)