An office lady from Marunouchi visits for a foot massage, but the therapist's skilled hands soon stimulate sensitive areas all over her body, driving her into instinctive arousal. The therapist deliberately targets secret erogenous zones she never knew existed, triggering intense excitement. Using special techniques designed to induce lactation, he pushes her body deeper into pleasure, vividly capturing her complete surrender to sensation. With a background as a sports instructor, the therapist uses his anatomical knowledge to seduce her more profoundly. What follows is a cruel, depraved session where the woman, losing all sense of will, succumbs entirely to her instincts, culminating in intercourse.