I am by no means an expert, but if your budget is $100 per person, I suspect you may be better off just going someplace near your hotel. I had a couple forgettable sushi meals in Tokyo, but the memorable one cost about $350 per person for lunch. (That was at Kanesaka, which has one or two Michelin stars.)

Inexpensive food can be found in Tokyo--and it's great--but it seems to be most common at quick-service restaurants (ramen, curry, katsu places, etc.). But there's a lot of fantastic but insanely expensive food, too, and even mediocre places can be expensive by non-Japanese standards.