Yes
Yes it is a good place to go alone but you will normally meet fun new people so you won't be alone.
Yes it is a great place to eat alone or with the group. Best Miyabi I've ever been in. The ribeye steak is fabulous Teriyaki Style
At the sushi bar, yes definitely. Each hibachi cooking area is designed to seat 8 people, so if you come alone or with a small group you're likely to be seated with others so the restaurant can maximize its seating.
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