At the request of a sadistic idle madam, Chie (Kobayakawa) is looking for a woman to be a human toilet, and catches the eye of Mariko (Hazuki), the only daughter of a wealthy man. Mariko (Hazuki) is kidnapped and imprisoned by Chie, who has infiltrated the house as a maid, and is raped by a masked man, and is forced to perform lesbian service to Chie while being trained to be a human toilet...