Midori and Tanigawa, who both hailed from the same hometown and moved to Tokyo around the same time. Tanigawa is a real estate agent, an outgoing and energetic guy. Midori works at the city hall, a quiet and introverted type. They bumped into each other unexpectedly while out and about. As they caught up, Midori mentioned that things haven't been going well with his wife lately. Tanigawa, inspired by this, invites the couple over for a house party and hatches a plan for a wife swap.
