Stayed in Mizu-no-Uta of the Tsuruga group in Oct 2013 while visiting Hokkaido right after landing.
Have stayed in onsen hotels operated by the Tsuruga group few times in Hokkaido. Picked a spacious modern room of more than 50 sqm, plus an outdoor garden with rotenburo. Selected meals in buffet style which was sumptuous with fresh seafood served in both Japanese and western styles. Dessert was generous as well.
Mizu-no-Uta literally means song of water. Have stayed in Shikotsu-ko 4 times till 2016 and this onsen resort was the best.