The Kishima and Toyoda families, who live in the same apartment building, have a monthly gathering that has become a tradition. The patriarchal Kishima family and the matriarchal Toyoda family's Airi and Yukiko bond over their troublesome husbands. Several days later, when Toyoda's husband refuses to go to work, busy Yukiko can't handle it, so responsible Airi goes to listen to his complaints. There, she learns that Toyoda's husband has quit his job and judges that the situation is unmanageable. So, Airi proposes to her husband and Yukiko that they should swap spouses…
