Kura Sushi is unstoppable in Japan and this location in the center of Tokyo may be the busiest but also the most vibrant. I absolutely love their selection and the tiny booths you and your friends are seated at whilst enjoying low-priced great sushi is simply perfection. In general, arrive 1h before your desired time to eat to pick up a ticket for the waiting system. During weekends and evening I'd come at least 2h early.