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A lot of anime/manga/etc Japanese pop culture fans (but especially anime/manga fans) call themselves otaku. Generally, it is assumed "otaku" means something like "nerd" or "geek", or to describe someone with much knowledge in a specific field. While those are part of the otaku definition, that's not all it means, and it's probably not the best idea to visit Japan proudly calling oneself an "otaku". Here's why.
(quote from the Wikipedia page on otaku):
"In 1989, the case of Tsutomu Miyazaki, "The Otaku Murderer", brought the fandom, very negatively, to national attention. Miyazaki, who randomly chose and murdered four girls, had a collection of 5,763 videotapes, some containing anime and slasher films that were found interspersed with videos and pictures of his victims." Since then, otaku has a certain connotation to a whole generation of Japanese: like a disturbed voluntarily shut-in outcast. And other than that lovely event already mentioned, it turns out Tsutomu is quite the sicko serial killer. So do you really want to associate yourself with any word used to describe that man?
Okay. Just wanted to notify everyone of that.