Karin, a female student interested in kissing. One night, while riding the train, she discovers a man sleeping in the seat opposite her. The car is empty… Karin kisses the man out of curiosity. From that night on, she repeats this every night. However, one time during the kiss, the man wakes up and the atmosphere becomes awkward… The two people locked eyes, and once their lips met again, they couldn't stop kissing. Alone in the empty train car, the two engaged in intense sex. After passing each other's nearest stations, the two got off at an unfamiliar station, entered a hotel, and spent the night kissing and seeking each other's bodies until morning.
