Densha Otoko: The Story of a Train Man Who Fell in Love With A Girl

Boy–bashful and not overly brave–defends girl from obnoxious drunk on a Tokyo train. Girl sends boy a thank-you pair of pricey Hermés teacups. Boy's a geek and doesn't know what to do next. End of story for most nerds–but this one turns to the world's largest online message board and asks for help, so for him it's just the beginning. This matchless love story is told through a series of Internet chat room threads. As Train Man, our hero charts his progress and unveils each new crisis–from making conversation to deciding what to wear on a date and beyond–in return, he receives advice, encouragement, warnings, and sympathy from the anonymous netizens. And Train Man discovers the secret to what makes the world go round–and proves we really do live in a universe where anything can happen.

It's about an Otaku guy who fell in love with this beautiful lady and tries his best to get that girl with a lot of help from 2channelers (people who goes/posts on 2ch). This story has become very famous in Japan and I believe they now have novels, several series of Manga (both Shoujo and Shounen), movie, drama, play, etc, etc.

Geeky fanboy Ikumi Saiki has a dream that someday, somehow, he'll finally get a girlfriend. Then one day, on the train home, he rescues a beautiful girl from a troublesome drunk. Now the girl sees the hero inside the otaku -- and it appears that Ikumi will finally find romance! But though Ikumi found the courage to save her, will he ever be brave enough to win her heart? Desparate, Ikumi posts an urgent plea on an Internet message board: "Help me with the girl of my dreams!" Ikumi's story ignites the whole online world. Everyone is ready to help Ikumi prove that even an otaku can find true love! (Source: Del Rey)

A hopeless geek, a beautiful woman, and a fast connection--could the Internet be his ticket onto the express train to romance? A real-life thread on an Internet forum sparks a nationwide phenomenon! A nerdy otaku meets a girl on a train and posts an urgent query on the Web--How the heck do you talk to girls? What should he wear on their date? Where should they go? The forum's response was overwhelming, and the thread continued to grow along with their relationship. Eventually published in book form to become a best-seller, the thread spawned a blockbuster movie and hit TV series, as well as this heartwarming manga adaptation of an entire Internet community rooting for love and romance. (Souce: Viz)