Alps isn't exactly destination dining, but sometimes it's good to know a place where you can just show up with a group of twenty people and no reservation. Plus they're open until 9am every night but Sunday! The Y1500 party menu supplies ample, decent-quality food, and drinks are surprisingly cheap. (Y500 table charge.)
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.