A note regarding this album:
Chudah's Corner and RPGFan both credit "Yuki Nita" as composer, but EroGameScape credits team RETRONICA.
I've done a bit of factchecking, and it seems that this page has the composers right:
http://www.sol.dti.ne.jp/~mushi/review/natusuna.html
Yuuichi Ohta is from team RETRONICA, and he is also credited as a composer on the OVA soundtrack (KDCA-0001). The other two are confirmed, since they are credited as the original track authors on the Remix Soundtrack (SMP-1742).
I've updated the artist fields to reflect this.