Not only does Beer Market offer the best selection of imported craft beers in Tokyo, but you can drink whatever you buy right in the shop, with just a Y100 corkage charge. They also have ten taps of craft beers (they were half Stone Brewing and half Mikkeller during our first visit) and a tiny food menu with light items like quiche and potato salad. The bar area, open from 4pm, is standing only.
You can also order online through Rakuten, but it's worth making the pilgrimage to this rather seedy corner of Kita-Senju just to see this inspiring beer selection in person.
This book will introduce you to more than twenty of Japan's favorite specialty foods that are less well known abroad, along with a guide to the best places in Tokyo to try them and expert tips on what to order. From Bento.com.