Nice pop/electronic feel at the beginning, mixed in with lush strings, I heard some Enya influences later in the song. Interesting blend of multiple ideas.
It sounds like Haruka Shimotsuki wrote the music and the backing vocal lines sound like Kalafina. This sounds like a song that Keiko Kubota could lead.
I use to listen to this beautiful song once a year staying at my village house. It's a little tradition of my own. I pray for the dark times my homeland experiencing now to end, so I can visit my village and enjoy this piece of art once again. Gotta thank Ceui for creating such a masterpiece :)
So I just found this out when I watched Hakkenden!!! I also knew that she is one of the artists behind the opening and ending theme of "Legend of the legendary heroes"