FS HF Chijo Anta mo Kyouhan yo 痴女～あんたも共犯よ

The main protagonist is a ronin, he spent a lot of time going to prep school and pass the university entrance examination but failed. One day, on the train back home, he meets a slut, right then and there out of nowhere she gave him a blowjob. After the event she introduces as Suminoe then he is forced to accompany the woman to her office.

The woman is a psychiatrist and currently is researching one topic "Why not finish with all the perverts" for that she threatens him into becoming a chikan and molesting girls on the train, all so she can study the behavior of the perverts and the molested girls.

He dislikes the idea of groping girls but he soon finds pleasure in doing it, also this becomes an obsession for Suminoe, she herself helps him molest the girls and...