Time Out says
Adding: Blue is a French restaurant hidden in tiny alley in Minami Aoyama. You can always order from their set menu, or with a little help from the waiters, you can also create your own menu by selecting special ingredients of the day from a serving cart. While you eat, you can watch the chef working busily in the open kitchen on the first floor. The second floor is more suitable for groups. The restaurant also has terrace seating. Try the five-grain rice dish, which goes well with the prosciutto-stock soup.