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Ichi the Killer is a Japanese manga series written and illustrated by Hideo Yamamoto. A first series, titled Ichi, was serialized in Shogakukan's seinen manga magazine Weekly Young Sunday in 1993; Ichi the Killer was serialized in the same magazine from 1998 to 2001, with its chapters collected in ten tankōbon volumes. The series revolves around Ichi, a psychologically troubled killing machine, and his confrontation with the yakuza of Kabukichō, Shinjuku.