Otaku Dancer?

The other day I hanged around the central down town of Osaka, and I found a Otaku dancer (Otaku : In modern Japanese slang, the term otaku refers to fan of, or is specialized in any particular theme, topic, or hobby. Common uses are anime otaku (a fan of anime ) and manga otaku (a fan of comic books or manga), Otaku's fashion is very unique, and they wear a frumpy cloth, because their interest is focused on the only anime or manga.).

He was dancing in front of the passer-by audiences. He is challenging to get a high score of Dancing Game at penny arcade.

His dancing is very sophisticated. I guess that he practiced and more practice.
It was very funny to see a gap in between his businesslike aspect and dancing skill like a professional dancer.