The Minami family is famous for being a mandarin duck couple. However, the wife, Shiori, has a secret side. One day, the manager wonders why a strange man is frequently coming and going from the Minami family home, so he sneaks in to see what's going on inside and witnesses a prostitution scene. When he visits again the next day, he finds the wife without panties, sticking out her ass and waiting for customers. The manager loses himself in the shocking sight and thrusts his penis into her. He goes ahead and cums inside the surprised wife. From that day on, the innocent wife becomes the manager's masturbator wife.