Dokidoki Chikan Club ~Nee, Densha no Naka de H Shiyo~

One day, Hiroyuki notices that Nami, his old friend, is molested in the train. Since he has no courage to stop it, he just puts his bag between Nami and the molester... The molester soon leaves the train... But Nami says, "I'm still sexually excited..." Since then, his life completely changes. He just molests Nami in the train every day... Also, his classmate, Nami's younger sister and his older sister join them...