Groper Train: Burusera Squad Exposed (1994)

Sayuri (Yumi Yoshiyuki) lives with her older sister Miho (Nao Saeki). One day, on the train to school, she meets Ozone, a man with outstanding technique, and ends up helping him sell used underwear and sailor uniforms by mail order. She ends up getting even more addicted after winning an unexpected amount of money.