Anime!

Tokyo traveler tells all about cosplay culture in Tokyo:

Actually there were some girls in the area, but guys definitely seem to predominate. So were does a strapping young Akihabarite go to meet members of the fairer sex? A Cosplay café, natch! Cosplay (“costume play”), for those of you who may not be familiar with the term, refers to dressing up in a costume and role-playing the character represented. Nerdy guys really dig it because: