densha otoko
Densha Otoko (translated as Train Man) is a Japanese movie, television series, manga, novel, and other media, all based on the purportedly true love story of an otaku.
The story was chronicled on the Japanese internet mega-BBS 2channel. This led to the compilation of the relevant threads in a book, followed by several manga versions, a movie, a theatrical play later released as a DVD, and finally a TV series.