A 30-year-old office lady travels to Tokyo for business once a month, riding the bullet train to and from the city. About half a year ago, she discovered an excitement in exposing herself on the train, and now she always engages in this act on her return journey. Ever since purchasing her ticket at Tokyo Station after work, she starts thinking about exposure, feeling her pussy heat up. By the time she boards the platform, her panties are damp with arousal. She says the ideal moment is one or two cars away from the last crowded train. After boarding her reserved seat, she immediately heads to the restroom while maintaining her usual business attire—knee-length tight skirt, blouse, and blazer. Inside the restroom, she removes her pantyhose and panties, storing them in her bag. Though she sometimes considers masturbating right there, she resists and returns to her seat. Her seat is a two-person bench, and beside her sits a man in his early thirties, also in a suit. With no panties on but fully dressed, she feels confident no one will notice. Slightly spreading her legs, she can sense the scent of her pussy rising from below. After a while, the man beside her falls asleep. Seizing the opportunity, she checks that no one is sitting directly in front or behind, then begins exposing herself. Slowly lifting her skirt, she eventually bares her entire ass and pussy. The man remains asleep. She pulls down the tray table in front to shield herself, then starts touching her wet pussy. Already soaked, she can't hold back and begins masturbating openly. Rubbing her clit while thrusting two fingers deep inside, sliding them vigorously, her arousal builds rapidly. She raises the tray table so her pussy faces the man sleeping on the opposite side, and climaxes. She lets out a soft moan, but the man doesn't wake. Still savoring the afterglow, she suddenly notices a trolley lady approaching. Flustered, she quickly folds the table back—but she might have been seen. Lately, however, she's been increasingly desiring for someone to watch her masturbate. She's now appearing in this AV, knowing her naked body will be seen by people worldwide. Yet she wonders—will this make her even more aroused than her usual secret exposures?