In Series Vol. 1 Chikan Densha 淫シリーズ　淫触痴漢電車

One day, he sees a man molesting a girl on the train. But she never resists it. On the next day, he molests the same girl on the train, but she doesn't resist. "What about other girls?" He molests other girl, but she doesn't resist, either. His molestation gradually becomes bolder....