A small food court and take out restaurants featuring a couple of dozen food stands and bakery or sweet shops on the first level. This is also a very comfortably air-conditioned place to wait for a train connection. There are three full-service restaurants on the upper level. A few examples include:
Ushio Sushi Bar
Cheap sushi by the piece or in sets. There is a bilingual menu and instruction sheet to help you with ordering and payment. There is also a quick take-out window to grab something for the road.
Tsubame is famous for its "hamburg" dish. Contrary to belief, lunch special only costs 1150 yen about $10 - a bargain for the excellent quality of food. The "hamburg" dish comes piping hot covered completely in an aluminum foil.
Atre New York Style
A collection of restaurants grouped around a Queen Isetan grocery. Dean & Deluca, on the second floor, has a take-out sandwich and coffee bar which is convenient for supplies to get you through a long Shinkansen ride. The fourth floor has the Lounge Foodium restaurant complex including Grand Central Oyster Bar.
Authentic Izakaya style restaurant with English language menu.
Collection of noodle restaurants from the "7 Masters of Ramen".
There are a cluster of quality noodle shops just south of the west exit, nestled under the roadway. Quite a variety of donburi, ramen, etc, some with lines at lunchtime and some without.
This is an excellent Japanese barbeque, with seafood and vegetarian options. Several waitstaff speak impeccable English.