I would initially not think there is a bustling food hall that locals use under what someone might initially think to be a tourist trap, but we have learned that good stuff can be in places like train stations or tourist zones - unlike in North America.
If you are in the area and stuck for food, try the food hall. Some vendors also do takeout. There is lots of variety and a fair amount of seating. Every thing from ramen, yakisoba, , beef, gyoza, burgers, sushi, desserts, matcha and more.