Shinji, the husband, was living happily with his young and beautiful wife Kanako after remarrying. At first glance, they seemed like a happy family, but in fact, there was a big secret. At the beginning of their remarriage, Kanako's husband was extremely busy with work and was often away on business trips. Unable to bear the loneliness, Kanako made a mistake with her stepson Atsushi. And although it was supposed to be a one-time promise, her son began to desire Kanako's body all the time...