Ayumi Kimito plays Yuki, a married woman living a happy life with her husband, until she becomes the target of a malicious stalker. Under the guise of an electrical inspection, the man sneaks into her home and plants hidden listening devices to spy on the couple's private conversations. When her husband goes on a business trip, the stalker confronts Yuki, forces himself on her, and refuses to leave her home. As the assaults continue day after day, Yuki's body begins to change against her will, responding physically despite her mental resistance. Tormented by guilt yet increasingly trapped by her own physical reactions, Yuki struggles with the emotional conflict of betraying her husband. The story portrays the psychological turmoil and inner conflict of a married woman falling into forbidden desire against her conscience.