Marina and Uchimura, who work in the same office, are in a double affair where they both have families and desire each other's bodies. - The two, who had been dating each other while avoiding public attention, had the same desire. - ``I want to forget everything and just devote myself to sex because it's okay once and for all.'' An affair trip called a business trip was planned to make that dream come true. - On that day, the two meet at the station, change from suits to civilian clothes, board the express train, and as soon as they arrive at a secluded inn, they passionately capture each other's lips...