Once a month, a married woman takes the night bus to Tokyo to visit her husband. She grows close to a kind man she meets during the trip, and despite both having families, their attraction erupts into forbidden creampie sex on the bus. After arriving in Tokyo, they wander deserted tourist spots on a late-night adult date, then enter a nearby hotel and spend the rest of the night having raw sex. Suppressing their desire to take the relationship further, they part and return to their respective families.