In line with the game by Anim.

For my child morning commute, a young woman witnesses some guy molesting a female on the train. Though she won't make an effort to stop him or demand help, she does do something about it: she pleasures herself. She soon gets depressed by the pervert's world, becoming a willing victim as well as a recruiter for his dirty games. She then ups the ante, luring her hot friends into the trap. All aboard!