Natsukawa and Kanda, who live in the same apartment complex, have a tradition of going camping once a month.Also, it was customary for his wife Ayumi and Kanda's wife to complain about their husbands to each other on the spot.The next day, Kanda and his wife get into a fight over something trivial.Ayumi can't stand seeing Kanda's wife run out of the tent and say she's going home, so she suggests they swap husbands to cool her head.However, the marriage exchange leads to an unexpected mistake...