Yuuto Haida, an otaku, suddenly gets asked by the class gal Kotori Sakurazaka to go to a doujinshi sale event. Despite already deciding to cooperate upon seeing her serious look, as an otaku he is getting overwhelmed by this gal who's being a little too close for comfort.

On top of all this, he gets told by Kotori "I'll show you my breasts if you can get me the stuff."...?!

(Source: DMM, translated)