From the website:
I was told it sold a "few" second hand games and cd's. Armed with a well drawn map (thanks Saori!), we traveled 3 stops from Oami on the Togane line to Gumyo. After walking for about 30 mins in sweltering humidity, we came to our destination. 2 large black shops loomed in the distance. From the outside, it looked like one of those stores where you purchase goods aimed at, shall we say, the more mature market. Upon entering the store, I was transported into what can only be called the "Nerd Nirvana".
Naturally, it's in Japan: Link - Thanks moronic50!