Takanashi and Tanaka, who came to Tokyo from their hometown at the same time. Takanashi works as a salesman for a real estate company and is an outgoing type. Tanaka works at the city hall and is the quiet type who gets his work done, leaning more towards being introverted. The two bumped into each other on the road. As they were updating each other on their recent situations, Tanaka mentioned that things haven't been going well with his wife's nightlife lately. Hearing this, Takanashi had an idea and planned a home party at his house, inviting the couple to engage in wife-swapping.
