I've been married to my wife, Rinko, for five years, and we've been together for 10 years, including a period of cohabitation. We now sleep in separate beds and haven't had sex in over a year. Our favorite pastime is having BBQs with the Uchimura couple, who live in the same apartment building. We were both struggling with the issue of a sexless marriage. During one of those BBQs, I said, "Swap," and Uchimura came up with the idea of ​​swapping couples, so we decided to swap couples for a day. We started swapping couples in the Kokoro of stirring up each other's jealousy, but we never expected that Rinko would end up being taken away from us...