爱情快递 - Misuzu takase

Yuto has been sexually frustrated for a while now. Whenever his girlfriend Misuzu has her duration, she does not let him touch her. He feels strongly neglected and proposes a deal to Misuzu that he may paw her in the train. In the beginning, both of them seem to like it, but soon other men will notice Misuzu and want to have fun with her too...