171cm tall and blessed with a mature, alluring figure, Kasumi Shirakawa sets a unique condition for a drive date: no bra. Though she normally dislikes going braless, the friction from the seatbelt during the drive gradually arouses her. Her favorite red bra is snatched away by the man in the driver's seat, leaving her torn between anxiety and excitement as her body grows increasingly sensitive. She begins masturbating with a vibrator, the pantyhose amplifying direct clitoral stimulation, pushing her to multiple orgasms. After warming up with a bowl of ramen, they head to a resort hotel in the suburbs, but can't wait—passion erupts in the car at the parking lot. Exposing her nipples and stripping off her pantyhose, she boldly spreads her legs in a wide M-position, deepening their intimacy. Still fully clothed, they perform 69 at the hotel entrance, and when an engorged cock presses against her swollen pussy, she loses all control. The "married mother" facade shatters as she transforms completely into a submissive woman. Riding him recklessly in cowgirl position, she bucks her hips like a fertile woman determined to conceive on ovulation day. Too impatient to undress fully or even reach the bath or bed, they plunge into a wild, animalistic creampie sex—this intense, unrestrained sequence is the highlight of the film.