NSFS-276 I can't believe my wife... 2 nights and 3 days of spouse swapping life Kazusaki Kuno

The Kuno couple and the Kanda couple, who live in the same apartment building, have a drinking party once a month as a tradition. One day, while the four of them were drinking, the husband started talking about a TV show about wife swapping, and by chance, they ended up swapping wives. However, the wife swapping leads to an unexpected mistake...