As sadomasochistic yakuza enforcer Kakihara searches for his missing boss he comes across Ichi, a repressed and psychotic killer who may be able to inflict levels of pain that Kakihara has only dreamed of.

A simple funeral turns a man's world Topsy turvy. He wakes up in a posh hotel room, totally clueless about how he got there. Slowly, he recalls what happened a day before.