So, I Hear You Like Sadistic Women

Shingo is a rookie white-collar worker. One day, a woman suddenly touches his cock when he is in the train. He is surprised and looks around, but the woman says, "Be quiet, or you'll be in trouble...." Also, another woman standing in front of him pushes her buttocks to his body.... The women finally put a paper into his pocket and get off. He takes it out of his pocket and reads it. The paper says the number of the line and the schedule. He decides to get on the train to complain them about it. However, he still doesn't know that the train is actually full of....