When a nerdy geek meets a girl on a train and he does not know how to talk to her, he posts an urgent query on the Internet, follows the advice that he is given, and keeps the Internet forum involved in every step of the relationship.
The name "Nakano Hitori" (中野独人) is a pun on the Japanese term "Naka no hitori", a term that refers to all the people who are part of message boards on the Internet. This name was used as the shared pseudonym of te author(s) of "Densha Otoko": a collection/adaptation of posts on an online message board telling the story of a nerdy guy after he meets a girl on the train.