Incest: "Mother, this house is insane."

The curse of incest, which lasted for the third generation of parents and children, led to the collapse of one family. She is a younger sister, Ayako, who has been jealous of her body since she was a child by her father like Koshi-ma, and although she couldn't stand such a family, she left the house, but she asked for her own son's body, Natsumi, and Kazumi, a daughter of Ayako who continued to have an ugly relationship with her older brother. When three women began to live under one roof, a party of forbidden incest with love and hatred was held.