I ate there while on a one day trip to Nikko, and it was the final point to a perfect day, not only the food was delicious, but also the service was excellent.
The place is a old traditional japanese house beautifully iluminated and decorated, with a nice garden to the side, which you can observe while having lunch, a really pleasant experience.
The food was delicious, the quality of the meat and fish was excellent and the most important part, was treated respectfully and with sense of taste, key steps to elaborate a delightful dish.
The service was far beyond from excellent, the metre took us to our table, attended us kindly and explained us some things we asked about the house, he even left us take some pictures and guided us to a nice view of the garden.
There's not too much left to say, I'd totally repeat the experience.