Groper Train: Fingers Won't Stop (1999)

Fujiko Yamamoto and Yoko have the same name as a famous person, and as a result, they are quiet sisters who are not good at asserting themselves. Only the youngest sister, Akemi, has an extreme personality, and at the young age of 21, she is divorced and has two children. One day, Yoko is threatened with a knife by a molester on the train and raped in the toilet. Meanwhile, Fujiko is engaged in an affair with her boss, Matsushita. The two feel envious of Akemi's free-spirited nature...