This is the best sushi/sashimi in Boston for pure fish, but you need to know what to get. Also, the slices/portions are HUGE. They say they buy a cut above Fugakku, etc.
It is not necessarily the best for the more exotic rolls/dishes.
My favorite is the Best Sashimi Sampler for $22, which includes 3 extra large pieces of tuna, yellowtail, and salmon (Pacific).
The spicy edamame is also awesome (free with delivery, which only costs $2 and is generally very quick). Prices are very appropriate.
Located right behind Fugaku, but don't expect much atmosphere....this is a tiny place, maybe 10 tables...but much better food than Fugaku.