Ichi the Killer (殺し屋1 Koroshiya Ichi) is a seinen manga series written and illustrated by Hideo Yamamoto. The series revolves around Ichi, a psychologically troubled killing machine, and his confrontation with the yakuza of Kabukichō, Shinjuku. The manga was serialized in the Shogakukan magazine Weekly Young Sunday from 1998 to 2001 and has been collected into ten tankōbon volumes in Japan. In 2001, the manga was adapted into a live-action film directed by Takashi Miike. An anime original video animation (OVA) titled Ichi the Killer: Episode 0 (殺し屋1 The Animation Episode 0 Koroshiya Ichi The Animation Episode 0) was produced by AIC and released in Japan in 2002. The OVA has been licensed for release in North America and the United Kingdom by Central Park Media and in Australia and New Zealand by Siren Visual. A second live-action film, 1-Ichi, was directed by Masahito Tanno and released in Japan in 2003.