Groper Train: Pickpocket, Woman and Groper (1991)

Keiko Hama, who works at a law firm, is molested on a crowded commuter train. She can't help but feel aroused by the molester's technique... However, after the storm passes, she realizes that her mother's keepsake earrings and wallet are gone. From then on, she and her friend Taeko take the train at the same time every day to search for the molester, but...