Stopped in the other night for dinner and was very impressed. It's located on a deserted side street near South Station..definitely off the beaten path and you feel like you are finding a secret place.
Small intimate space, brick exposed walls, beautiful solid wood sushi bar..
We had 6 dishes from the nigiri/sashimi page and 1 cooked dish..and all were spectacular. We`sat at the bar (only place to sit IMO) and watched the chefs work...beautiful fish and interesting sauces/spices/herbs. There are probably 12 or more different squeeze bottles with different sauces.
One issue; if you go when they're not too busy..we were there about 7..you basically have a private chef. That's good; but the drawback is that you could probably be in and out in 1/2 hour to 45 mins. That may be a positive for some; but I like to spend a little more time enjoying a fine dinner...issue that's easily resolved..we sipped our sake and ordered the braised pork..but just something to be aware of. I'd drink more between courses and order more slowly next time..:) also bring a nice baguette to soak up some of the sauces..:)
As others have mentioned; it's expensive. Is it worth it? It's certainly not a "best value" but if you can afford it and enjoy Japanese food..yes. It's on a par with Uni price wise..and it's a more complete restaurant with a full kitchen. I don't think there's anywhere else in Boston except Uni to get the fish and creative preparations that are available here. The ingredients they are using are expensive..qualifier..I haven't been to Oishii SE yet.
I checked an old cc bill..and almost to the $, it was the same price as a recent "dinner" in South Beach where we had a few apps at the bar at David Bouley's new restaurant in the Ritz..Japanese menu..and on to Nobu for a few more.
The service was excellent and the owners are very gracious...offering us a dessert of sparkling sake.
I could write more but I put some comments on my pic site..