Must-visit shops for otaku

while I'm in Japan, I figured I'd try to behave a little like Densha Otoko.

Are there any must-visit shops that would interest japan pop culture otaku?

Offhand I can only think of Mandarake in Shibuya. Are there any others for themes like


Doujinshi
Resin models
Cosplayers
Weird Japan fetishes

Having just 2 days there, I'd rather know exactly where to head rather than hunt around slowly. Maybe I'll take it slow during my 2nd time there, probably next year.

Mandarake has more and bigger stores at the Broadway mall in Nakano.

NAKANO BROADWAY
In 2F of here, there is a shop of COSPLAYERS and FIGURE.
http://www.club.nokia.jp/tokyoq/weekly_updates/tqoole/bway.html
Japan: Day Seven – Nakano Broadway | Ramblings of DarkMirage

Otome Road
A popular name of a western road of Sunshine City 60 in the Ikebukuro station east exit.
Of woman inclination,Shops of Anime and Manga gather.
(BL YAOI ....)
Otome Road
http://www2h.biglobe.ne.jp/~TOWN/town/anime.htm

The shop which is famous in Akihabara.
TORAﾂ NOﾂ ANA
同人誌・女性向けコミックのとらのあな女子部成年向け通販

GAMERS
http://cgi.broccoli.co.jp/gamers/honten2/main.html

ANIMATE
http://www.animate.co.jp/animate/map/east/akihabara/akihabara.html

AKIHABARA
http://www.akiba.or.jp/english/index.html

A shop of OTAKU in Shinjuku.
yellowsubmarine
http://www.yellowsubmarine.co.jp/main3.htm

http://users.skynet.be/wackotaku/worldshopping/shoptokyo.htm