Based on a supposed true story, the film stars Yamada Takayuki (from Water Boys and Crying Out Love in the Center of the World) as a twentysomething computer nerd who goes by the chat room screen named "Densha Otoko" ("Train Man"). Out of nowhere, he soon finds himself in an unfamiliar role as "protector" when he ends up saving a woman from the advances of a drunken salaryman (Osugi Ren) on a commuter train.
Miki Nakatani (from Ring 2) takes on the role of a beautiful office lady who eventually takes a slight interest in this socially-inept otaku. A complete moron when it comes to the ladies, this young computer freak would rather stay in his fantasy land of anime, manga, toys, and computer games than face the real world. Thus, when faced with the proposition of dating this new woman, he turns to the anonymous chatroom pals for support, asking for tips on what just exactly he should do to win this woman's heart.
Densha Otoko is ultimately a nice guy, but for whatever reason, things just haven't happened for him yet in the romance department. Despite his shyness, he's definitely looking to make some changes in his personal life. But will their advice pay off? Can there be chemistry between these two vastly different people? And is there any chance that this guy will actually grow up? The answers await in Densha Otoko, a curious spin on love, life, relationships, and the unabashed glory of otaku geekiness