@Zex
sorry , i tried to find Shikkoku no Shaga The Animation on anilist but could'nt because i had disabled " +18 content " ( my mistake ) . Yes , i want songs by both , the singer as well as artist . You see , i'm in love with treasures song and want to listen to more song like it .

But i cannot find more song from either of them :( .
Thank you

xD

http://profile.ameba.jp/wadanaoka
https://twitter.com/naoka_fbear/media

After some digging, I now know that her blood type is O, born in Osaka and wants to live in Hawai but no, have no clue on her discography.

I was able to find the composer's work on http://vgmdb.net/artist/1526 but it did not list that treasure song. Maybe it was just one time thingy and she is actually not a professional singer.

It might be faster to find a singer with a similar voice..?