In Japanese the word Otaku literally means "your home," but it's also come to describe someone who is deeply interested in comics, manga, video games or something similar.
Sometimes these collectors go to extremes and dress up like their favorite character.
In Japan this is called cos-play.
Author Patrick Galbraith met many die-hard fans of Otaku in Japan.
The result are these images taken from his book "Otaku Spaces."
(Slideshow Photos: Androniki Christodoulou)