/jp/ - Otaku Culture

I'm visiting Nipland at the end of the year and I'm preparing myself for the trip. I'm reading through traveling sites and blogs, but I'm the most interested in seeing various places related to the otaku culture, and normie sites usually just talk about common places that everyone know about anyway, like Akiba or Shibuya.
Where can I go to experience true weebness? What kind of shops, besides generic Mandarake and Poke Center, do I have to see? Where are nip otaku usually hanging out?
Share the knowledge if you can kudasai.