One day, Natsume, a plain female college student with little sexual knowledge, encounters a molester on the train. "It's disgusting," "I can't stand it," the molester plays with her body as he pleases, and develops her more and more... She can't make a sound on the train, and she endures the pleasure as the molesters' hands increase one after another... Before she knows it, she is surrounded by a group of people and falls into pleasure as she is molested silently...