"I'm sorry this is so sudden, but I want to end it..." Yuko breaks up with her cheating partner, Hideto, in order to improve her relationship with her husband. Hideto is shocked by her sudden confession, but senses her sincerity and makes her promise to have sex with him one last time. Hideto has an abnormal obsession with Yuko, who wants to move on after ending their relationship. After much deliberation, he decides to use a chastity belt to restrict Yuko's marital life. And on the appointed day, he gently puts the chastity belt on Yuko as she sleeps beside him and locks it in place...