Aoyama is usually fully reserved on weekends, and reservations are highly recommended! I would suggest reservations on weekends as well. Their quality is consistent at every visit, and their chef does not disappoint.
They have good sushi or sashimi sets for dinner that offer a decent variety of fish! In addition to the regular menu, I always go for their specials - they have good handrolls and a la carte sushi/sashimi on there!