Starring Kyoko Maya, this film portrays a short adulterous trip with a married woman set aboard a sleeper train. Waiting at a Tokyo terminal station at dusk, she boards the train, excited for her first rail journey—but after dinner, her excitement gets the better of her and she falls asleep. When she wakes up, the erotic scenes begin: she undergoes training with a remote-controlled vibrator in the train corridor, flashes her panties, receives oral sex and foreplay in the train toilet, and engages in intense intercourse. Fearing discovery by other passengers, her partner muffles her moans by stuffing her underwear into her mouth as they quietly enjoy themselves. The next morning features more blowjob scenes in the shower room and a final round of passionate sex in the cabin. The film captures her climax as she cries out, "Help me. Help me."