Try google.
Seriously, if you want literature on Japanese pop culture etc., you'll need to study Japanese. I have a book here just about Shibuya and the culture there published in 2008 but it is in Japanese.
It make sense doesn't it, there are more books about Japan in Japanese than there are in English.
If you just want travel information, try
japan-guide.com - Japan Travel and Living Guide
Oh and if you do make it to japan, keep an open mind. Remember, you are gaijin, if you see some Japanese behaviour/values are weird, remember noone else thinks so except you.