Original (by ZUN):
遠野幻想物語
The Fantastic Legend of Tohno
Perfect Cherry Blossom Stage 2 Theme
Arrangement: Kikuo
Vocals: ココ (Innocent Key)
Lyrics: Sakuma Aiko
Circle: Iemitsu.
HP:
http://iemitsu.net/Album: Re5-W-Catalogue Number: SICD-049
Released October 12, 2009.