Kana and Nishijima, who work in the same office, are in an adulterous relationship, secretly craving each other's bodies while avoiding public eyes. Since both have families and cannot meet freely, they shared the same desire: "Just once, I want to forget everything and spend all my time doing nothing but having sex." To make this dream come true, they planned an adultery trip disguised as a business trip three months in advance. On the day of the trip, the two met at the station, changed from their suits into casual clothes, and boarded the limited express train. As soon as they arrived at the inn, they passionately stole each other's lips...