More than forty craft sakes from small breweries around the country are offered here for your delectation, with most priced at around Y500-700 per 90ml serving. The food menu offers appetizing sake-pairing options like grilled dried fish (himono), seasonal vegetable tempura and numerous duck dishes.
Nagi bill themselves as a sake and soba restaurant, and in addition to the typical bowls and trays of hot and cold noodles they feature an unusual "soba sashimi" - wide ribbons of freshly made buckwheat noodle served cold with a dipping sauce. You can also try dabbing the noodles in green-tea salt, which really brings out the nut-like flavor of the buckwheat.
The grilled, dried anago eel is another excellent sake companion, served with a plain mayonnaise dip, and the roast duck is juicy and very meaty. The sake selection is solid and reliable, although there aren't as many seasonal specials as you might expect from a sake specialty bar.
The long, thin dining room is comfortably furnished, and there are a couple of semi-private rooms in the back for parties. Budget around Y2500-3500 for dinner with drinks. They also serve lunch.
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.