Koroshiya 1 The Animation: Episode 0

An investigation into killings in Shinjuku draws a detective toward Ichi and his obscure past. He seeks to understand the roots of Ichi’s violence and the influence of the man known as Jijii.

Memories and relationships reveal the path that led Ichi into murder. As the inquiry reaches deeper into his psychology, the case becomes a disturbing search for the forces that shaped him.