In Series Inshoku 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....