A "phantom member" of the Genshiken, Haraguchi rarely shows up at the club room, and when he does, it is almost always bad news. He is a member of the Manga Society and Anime Society as well, but has paid his club dues for none of them.

Called "Haraguro" by those who are unfortunate enough to know him, he is roundly disliked by everyone in all three groups, and only grudgingly tolerated by his much-touted connections among semi-professional manga artists. However, as he tends to intimidate others into submission, few are willing to voice their complaints in public.