After returning to work following several years away, married woman Hana struggles daily with poor health but continues commuting diligently. A coworker gifts her a massage therapy coupon, which leads her to therapist Sakagawa. Under his skillful hands, she gradually relaxes into a deep state of comfort. However, during the session, sensitive areas are deliberately stimulated, and overwhelmed by unexpected pleasure, she is forcibly fondled. Unable to resist the intense sensations, she ends up being taken against her will. Intrigued by Hana's unexpected responsiveness to his rough and aggressive advances, Sakagawa becomes obsessed and begins showing up at her home uninvited. Trapped and terrified with no escape, Hana nevertheless surrenders her body to sensations she's never experienced before, embarking on a series of forbidden encounters that awaken her lewd desires.