Groper Train: One Minute Before Departure (1985)

Kimiko, who came from the countryside, gets a job at a travel agency, but the manager she is introduced to is Yu, who was the person who molested her on the train. Feeling somewhat responsible, Yu teaches her the job and also gently guides her to become a more urban woman. Kimiko begins to have feelings for him, but is shocked to find out that Yu secretly loves Eri, the secretary to a client's president. Then, due to a certain incident, Kimiko ends up going to a hotel with that client's president, Chikamatsu...