In the dimly lit alleys of Tokyo, Ichi the Killer, a deranged murderer fueled by a bone-chilling secret, faces off against a sadomasochistic gangster. Despite the mobster's tolerance for pain, he is unable to withstand Ichi's brutal and merciless tactics. The city trembles with fear at the very mention of Ichi's name as the shocking truth about his monstrous tendencies is uncovered.