Hi, I've been to nrt lounge 4 times last year when i made cdg-nou.
The lounge is very very nice but can be crowded at the end of the day.
The continental lounge near to it seems to be larger.

There are sushi but they are coming only by 10 or 12, so you need to keep an eye to the waitress.

And if you like beer, there is one thing that only japanese people can do: an automatic beer on tap. It's very nice !