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When yakuza boss Anjo disappears without warning, along with a prostitute and one hundred million yen, loyal but psychotic, sadomasochistic hitman Kakihara takes it upon himself to lead the search, employing various methods of torture, mutilation and murder as a means to an end. Along the way, he meets sexy club hostess Karen and through her learns of the near-mythic Ichi, an armour clad, razor-booted assassin with incredible martial arts skills and serious emotional and psychological problems. Could Ichi be the one behind the disappearance of Kakihara’s boss?