A woman takes a night bus once a month to visit her husband in Tokyo, who lives there. During the journey, she becomes close to a kind man and they end up having an affair while riding the bus. Despite their respective family situations, they are drawn to each other and engage in secret creampies. After arriving at their destination, they go on a late-night date exploring empty tourist spots. They spend the night together at a nearby hotel, enjoying a passionate one-night stand filled with multiple creampies. Although both parties have feelings that could deepen their relationship, they decide to leave each other's homes and return to their families.