Kana and Nishijima, who work in the same office, are in an affair where they secretly desire each other's bodies, away from the public eye. Both have families and cannot meet freely, but they share the same desire. "Just once, I want to forget everything and devote my time to sex." To make this dream come true, they plan an affair trip disguised as a business trip three months in advance. On the day of the trip, the two meet at the station, change from their suits into casual clothes, board the express train, and as soon as they arrive at the inn, they passionately kiss each other...