I have been loking for this The Wallflower (TV) - Anime News Network (
http://www.animenewsnetwork.com/encyclopedia/anime.php?id=6818)
for a long time. :/
I think there was not soundtrack release at all.
Also you have here the jigoku shoujo soundtracks, where he features
Thread 48377
and this one where is also here....
Konnichiha Anne Original Soundtrack
http://forums.ffshrine.org/f91/world-masterpiece-theater-collection-63760/24.html#post1553022
Hiromi mizutani and Yasuharu Takanashi are both artists "Trained" by Daisuke Ishiwatari. Yes, the guy who creates and composes Guilty Gear sagas. :p
Hope this helps for now. :)