Hibiki Otsuki, a sadistic masseuse, takes the hand of a married woman and leads her down the path to masochism. Yashiki Rena, her junior from school days, visits the salon seeking relief from the exhaustion of motherhood, and Hibiki carefully works on her body, gradually arousing her desire. As her nipples are stimulated during breast massage, and through humiliating positions and lewd devices, the woman's dormant submissive nature awakens. She trembles in disbelief at the reality of having sex with another woman. Her desperate longing becomes clear—she craves to be penetrated with a strapon.