Yuna and Samejima, who work at the same workplace, have a secret affair. Both having families, they can't meet freely, but they share a dream: 'Just once, I want to have sex from morning till night without anyone interfering.' To fulfill this desire, they planned a business trip as an excuse for their affair several months ago. On the day of, the two met at the station, changed from suits into casual clothes, and boarded the Shinkansen with high spirits. As soon as they arrived at the hotel, they passionately kissed...
