The innocent music college girl becomes addicted to train groping... and turns into a pervert! One day, a beautiful college girl is groped on a crowded train. "It's disgusting... disgusting..." she thinks, but the stranger's touch is surprisingly good, and she finds herself enjoying it. She experiences both terror and climax at the same time. A university professor who witnesses this girl's reaction to the assault later... also starts groping women. As a result, the pure girl can't forget the feeling of being touched in her crotch on the train... and eventually becomes a pervert herself.
