The Miura and Kotsuka couples, who live in the same apartment building, have a monthly barbecue on the rooftop as a tradition. Additionally, it's customary for the wives, Ayumi and Ayako, to complain about their husbands during these gatherings. A few days later, Ayumi gets into an argument with her husband over a trivial matter, storms out of the house, and says she's going back to her parents' place. Unable to watch idly, Ayako suggests that Ayumi cool off for a few days until they make up, proposing a spouse swap in the meantime. However, this spouse swap leads to an unexpected mistake…
