Bousou Kareshi

Haru always gets dumped and this last time, he gets so sad and drunk that he ends up buying a cologne from a street vendor which is suposed to 'make him popular'. He gives it a shot, only to realize that girls dislike the smell, but it drives men crazy. An incident with the school nurse culminates in Haru and Kou (his best friend) having sex. Does Kou really like him or is it the perfume?