Not much more to be said as many reviewers have already said it, but I'll up the ante and say I waited FIVE hours for Sushi Dai - and had not one regret after the fact. It was a pain, but we got to the line at 7. And because they want each group (you're brought in by groups) to have such a special experience, they honor that each group will be in there for about 45 minutes while the rest wait. Luckily we met a fun group ahead of us, so we got to know them VERY well and we swapped tips for where to eat that week in Tokyo. Anyhow --- you will never have such fresh sushi in your life. And trust the chefs about exploring if you're ordering individual like I did (I have specific fish allergies that makes it easier to order individual pieces). I had the best kai and kanpachi of my life here and will never ever forget it. The chefs are lovely as is the woman host - she will treat you like gold. So: go to Sushi Dai, wait, bring a book or seating pad for the ground, and get ready to have the experience of a lifetime.
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