Marina and Uchimura work in the same office, and while both have families, they are in a double adulterous relationship, desiring each other's bodies. The two, who meet up repeatedly while avoiding the public's attention, share the same desire. "Just once, I want to forget everything and just devote myself to sex." To make that dream come true, an adulterous trip was planned in the guise of a business trip. On the day of the trip, the two meet at the station, change from their suits into casual clothes, board an express train, and as soon as they arrive at a secluded inn, they passionately kiss each other...