The Miura couple and the Kamitsuka couple, who live in the same apartment building, have a monthly rooftop barbecue as a tradition. It is also customary for the wives, Ayumi and Ayako, to complain about their husbands there. A few days later, Ayumi gets into an argument with her husband over something trivial. Ayako can't bear to see Ayumi run out of the house and say she's going back to her parents' house, so she suggests that they swap spouses for a few days to cool down and make up. However, this spouse swap leads to an unexpected mistake...