Chao and Oshima, who work in the same office, secretly engage in an affair. Both have families and cannot meet freely, so they share a common desire: 'Just once, I want to forget everything and indulge in sex.' To fulfill this dream, they planned a business trip as a cover for their affair a few months ago. On the day of the trip, they met at the station, changed from suits into casual clothes, boarded an express train, and upon arriving at the inn, they passionately kissed...
