Kitano Yuna and Samejima, coworkers, are engaged in a secret affair. Both have families and cannot meet freely, yet they share the same dream: to enjoy sex thoroughly from morning until night without any interruptions. To fulfill this desire, they've been planning an affair trip under the guise of a business trip for several months. At the meeting station, they shed their suits, changed into casual clothes, and enthusiastically boarded the bullet train. The moment they arrived at their hotel, they could no longer restrain themselves, passionately locking lips and marking the beginning of a new journey together.