Mikado Sushi is on the fourth floor of Vincom Tran Duy Hung in Yen Hoa, Hanoi, and serves conveyor-belt sushi. You pick sushi off the rail and order anything not on it separately. On weekends the turnover is fast, so items that rarely appear on weekdays come onto the rail. During quiet hours there are many similar pieces of sushi, and sushi that has been circulating can be firm.