Koroshiya 1 The Animation: Episode 0  

Ichi The Killer: Episode 0, Koroshiya Ichi The Animation: Episode 0, 殺し屋１ THE ANIMATION EPISODE 0, Koroshiya-1 The Animation

In tokyo's dark streets, a masochistic mobster encounters his adversary, ichi, who is a psychopathic murderer with an insatiable desire for violence. a chilling secret lies within him, and he mercilessly executes his victims. the truth behind the monster will be unveiled, causing the city to face its greatest terror in the form of ichi the killer.