Nakazawa married Sumire, who is a year younger than him, after an office romance. He was living a happy married life with his young and cute wife, but there was one problem. He had been impotent since their marriage, and their sex life was not going well... At that time, he happened to meet Ikeda, who was his boss at his previous company. While talking about their recent situations, the topic turned to their sex lives, and Nakazawa consulted him about the fact that things were not going well with his wife. Then Ikeda asked him if he would like to try swapping his wife Ruisa with Sumire...