You would never know by looking at the outside of this restaurant, but they have some of the best sushi in the area. It's located in a basement location across the street from the Prudential.
The menu's extremely extensive and offers more than just sushi, too. In fact, I normally order the shrimp and vegetable tempura, which is a gigantic pile of fried food that could easily be two meals.
Also, the restaurant is open late until 2AM, allowing you to eat great even late.