Stressed from her husband's long-term work assignment away from home, married woman Mei becomes engrossed in masturbating in the living room during the daytime. That's when Ataru, her son's friend who came over to play, accidentally witnesses the scene. Ataru becomes aroused seeing his friend's mother pleasuring herself and secretly takes photos with his smartphone. Using the photos as blackmail, he begins to pressure Mei. Though she resists, Mei is eventually overpowered by Ataru and forced into sexual submission, leading to an agonizing, intense encounter.