Hissatsu Chikan Nin
English title: The Last Train To Gropesville
Japanese title: 必殺痴漢人
Type: OVA
Episodes: 2
Source: Visual novel
Genres: Hentai
Studios: Y.O.U.C
Producers: Digital Works
Duration: 26 min per ep
Rating: Rx - Hentai

One day, when Koichi was on a crowded train, a girl in front of him suddenly cried out, "He's a train molester!" "What!? No, I didn't do that!" He was mistakenly arrested for train molestation. Two years later, Koichi is now on a train to take revenge on that girl, "I'll do it...."