At first, Nanami, the wife, was reluctant to live with her father-in-law, but she agreed when she found out she could run her dream private yoga school at her parents' house. One day, during a private lesson, her father-in-law witnessed Nanami being attacked and assaulted by a male client and misunderstood it as her cheating, and began to blackmail her. Once the restraint was gone, the father-in-law continued to assault her at every opportunity. Gradually, Nanami became physically and emotionally dominated by her father-in-law, and even when her husband was around, she ended up having a physical relationship with her father-in-law.