Sasahara Kanji is a college freshman who decides to join a student society to share his hidden thoughts on manga, anime and gaming. 
When he first visited Genshiken, short for "Gendai Shikaku Bunka Kenkyuu Kai" (Society for the Study of Modern Visual Culture), his groundless pride was destroyed by the plotting of Madarame, a sophomore student in Genshiken, but he still couldn't admit that he is an otaku. 
However, as he participates in society activities such as visiting dojin (private publishing) shops and anime festivals, and hangs out with other society members Kosaka (a hardcore otaku despite his extreme eccentricities and good looks), Kosaka's girlfriend Kasuga Saki (who isn't really an otaku), Ohno (a cosplayer) and the others, he opens his mind and resolves that he will make his way into the otaku world. With their help, Sasahara slowly adjusts to otaku life in Genshiken. 
(Source: AnimeNfo)

It’s spring of freshman year, and Kanji Sasahara has a difficult dilemma. Should he declare his love for manga and anime fandom by joining an otaku club, like he has always wanted to? Is he prepared to deal with the social stigma attached to being an otaku? Meanwhile, Saki Kasakabe has her own otaku conundrum. How can she turn her boyfriend, anime fanboy Makoto, into a normal guy? Kanji follow his heart as does Saki. When both Kanji and Makoto join Genshiken: The Society for the Study of Modern Visual Culture, Saki chases Makoto through the various activities of the club from cosplaying and comic conventions, to video gaming and anime model figures. Saki finds otaku to be more than she imagined, but not necessarily in a good way.
 
(Source: Kodansha USA)

Kimura