mediocre, not my favorite for sushi or hibachi. roppongi was not bad but not great either. first, i had expected the interior of the restaurant to be a lot nicer judging from the exterior. in terms of atmosphere, roppongi was fine but if you sat in a booth, the tables and booths were kind of cheap looking while nagasaki really has a nice decor with the pond and bridges and fish tanks.
i ordered the bento box for $24 and my husband ordered the chicken bolgogi. they first brought out salads and soup. both were fine, but i much prefer nagasaki's salad dressing and soup. then they brought a spicy tuna hand roll that came with my bento. that was probably the highlight for me. i'd never had a hand roll, and i enjoyed the spiciness.
the bento came with tempura shrimp and vegetables (sweet potato and potato) and that was pretty good. the california roll was not bad but just meh. i would say the hibachi vegetables, shrimp and beef were a little on the cool temperature side - not bad, but the beef was kind of odd. it was like they had cut a cross section through a rib, rather than serve it length-wise, so you were getting a small bone with meat around it.
my husband's chicken bolgogi was one of the menu recommended items,but it was pretty disappointing. the pieces of chicken had a really odd texture - almost looked like chicken livers to me. the sauce on the chicken and noodles was ok, but far from a favorite, and neither of us would have listed this entree as a signature dish to the restaurant.
so overall it was not a bad experience - the service was good, but if i want hibachi i won't comebackagain but will go to nagasaki or even zuki.