Just browsed through some random chapters of Kyoshiro to Towa no Sora and it seems I was right about カオン being written as 歌音. Not sure about any romantic yuri elements involving Kuu, but there may very well be, as I didn't manage to find the first 5 chapters ^^; No flute scenes so far, but plenty of service in the manga...
In either case, it starts with Kuu thinking about her prince in shining armor ^^;
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