The Term Otaku ,equilalvent of the word geek,is a commonly used word to refer to someone who is obsessed or fatuated with certain Japanese media elements like anime, manga, and cosplay. Otaku use these things as outlets or to get away and forget about their stressful, realistic lives and submerge themselves into the fantasy world of anime, games, and cosplay.

Otaku, or sometimes pronounced wotaku , are the social outcasts of Japan, which is the common stereotype in Japan. The Otaku culture is rapidly growing in Urban Japan espacially in the Akihabara district in Japan, also known as Electric town. Here's a video that will explain more in detail: