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 achieving.
A jaded psychiatrist sees a client who is having hallucinations. He uses hypnotism to seek answers into her dark past, but soon gets wrapped up in her delusions and starts to fall for her charms...