The first thing I always do whenever I return to Japan is hit the McD's in NRT. The teriyaki burger is very tasty. (Also, I'm somewhat starving after the flight.) They've also got great regional food during Christmas (McCroquette and some specialized soups). The service is always great because there's usually 10 people ready to help the 3-4 people in line and breakfasts can be ordered any time of day.

After that, it's out of my system. Great Japanese food from then on!