Teacher Nao was worried about her relationship with her husband's stepchild Shinichi. One day, Nao is sexually assaulted by her friend Akira, who is bullying Shinichi, and the whole story is filmed and her weakness is grasped. When her sensitive Shinichi finds out about it, she interrogates and rapes her. From that day on, Nao becomes a sex toy for the two of them, and she continues to be double-penetrated.
