Hired by a wealthy sadist to find a woman she can turn into a human toilet, Chie (Kobayakawa) targets Mariko (Hazuki), the only daughter of a rich family. Chie infiltrates the household as a servant, then has Mariko abducted and imprisoned. A masked man rapes her, and Chie forces her to perform lesbian sex acts as she is relentlessly conditioned into a human toilet...