Nanami reluctantly agrees to live with her father-in-law because it lets her open her dream private yoga studio at the family home. When a client attacks and rapes her during a private lesson, her father-in-law witnesses it, mistakes the assault for an affair, and uses it to blackmail and rape her himself. Once unleashed, he keeps assaulting her until he controls her body and mind, eventually making her maintain a sexual relationship with him even while her husband is home.