Hatsumi Asada is cleaning her son Noboru's room when she discovers a hidden porn DVD. Out of curiosity, she sneaks a look and, despite feeling guilty, begins masturbating. At that moment, Noboru returns home and sneaks into the room, attacking her. From that night on, Hatsumi is treated as a "sex slave," forced to submit to his sexual demands. She seduces her husband, leading him to bed. Then, Noboru's actions take a disturbing turn…