Miyazaki Yoshimi is a 38-year-old housewife who has been married for five years. This is her first experience on a sleeper train, and also her first experience with a man other than her husband. The train departs with tension and anxiety. She wriggles her sensitive body, which she had been holding back through masturbation, and indulges in sex while her naked body is reflected in the train window. The next morning, she washes her body in the shower room, plays with a vibrator, and once again takes a man's penis into her mouth.
