Chikan Densha Otoko 2 ~Densetsu he no Liner~  

 痴漢電車男2 ～伝説へのライナー～

Ono belongs to a molestation network group. But one day, other members get arrested and the group breaks up. He has lost his passion for molestation, just doing train molestation by habit. One day, he meets a man who is called the king of train molestation on the train. He is surprised to see his molestation techniques and decides to improve his techniques....