It was common for the Kijima and Toyota families, who live in the same apartment building, to gather once a month. The Kijima family, the husband-in-law, and the Toyota family, Airi and Yukiko, both of the world-renowned Toyota families, hit it off with the cumbersome complaints of their husbands. A few days later, when her husband was told that she wouldn't go to work at the Toyota family, Airi, who has a strong sense of responsibility, goes to listen to the busy Yukiko. So, learning that the Toyota family's husband has quit his job, Airi decides that he is not in a position to take his eyes off the job, and proposes a husband and Yukiko to exchange a couple...