Upstairs restaurant with small, but nicely decorated sushi bar. Service was excellent, and the food was as well. One item to try is the spicy tuna on the wasabi crackers (an appetizer). Very unique and tasty! Being that most japanese restaurants in this area do not have sushi, I would say definitely try this place especially if you are staying at the Courtyard Marriott in Rye. Don't even think about the place up the street. Come here to Koo, but don't forget to bring your wallet!
Pros: Courteous and prompt service, excellent food, romantic but quaint
Cons: Parking, somewhat limited menu