This is a very popular place for lunch - it is crowded during the weekdays with people working in the financial district. I came here on a Friday evening and it provided for an intimate setting. There were a few tables and it was quite casual and relaxed.
I think the benchmark of a good sushi/sashimi restaurant is how they make their chirashi don (or an inside out sushi burrito". Ninki truly meets that test as their salmon and salmon chunks (covered with a delicious mayo sauce) is really fresh and tender. The tuna actually does melt in your mouth and is complemented by sesame on a bed of rice. Ninki knows how to get it done.
I will be sure to be back to try their other dishes.