After her husband loses his job, Kana becomes a housekeeper for a wealthy family. When the owner leaves on a week-long business trip, she is asked to stay at the house alone with his adult son Takashi, who is preparing to retake his entrance exams. Takashi gradually reveals a sinister side through obscene games, stolen belongings, sleeping pills, and sexual harassment. He deliberately makes Kana commit mistakes, then exploits them to reduce her to an obedient sex slave. Forced to service him every day and fulfill increasingly perverse demands, she is collared like a pet and ordered to worship his penis. An aphrodisiac finally sends her into uncontrollable heat, arching her body and rolling her eyes as she climaxes.