[Mosaic Removal] It is customary for Mr. and Mrs. Miura and Mr. and Mrs. Kanzaka, who live in the same apartment building, to have a barbecue on the roof of their apartment building once a month. It was also customary for the wives, Ayumi and Ayako, to complain about their husbands to each other on the spot. A few days later, Ayumi gets into a fight with her husband over something trivial. Ayako can't bear to see Ayumi run away from her house and return to her parents' home, so in order to cool her head, Ayako suggests that she swap spouses for a few days until they reconcile. However, the marriage exchange leads to an unexpected mistake...