I'm looking for these songs from the anime, Koihime and Zudo Koihime (Koihime's sequel; could possibly be called Koihime 2):

"Forever Precious Love" by Millio
"Naze?" by Haruhi Terada

Here's information about the anime:

http://www.animenewsnetwork.com/encyclopedia/anime.php?id=275
http://www.animenewsnetwork.com/encyclopedia/anime.php?id=4931

That's the best info I can give. I really hope someone can find them.

EDIT - More info:

http://www.lastfm.jp/music/millio
http://www.cdjapan.co.jp/detailview.html?KEY=LACM-4040
http://www.lastfm.jp/music/millio/%E6%81%8B%E5%A7%AB+%E3%83%86%E3%83%BC%E3%83%9E%E3% 82%BD%E3%83%B3%E3%82%B0%E3%82%B3%E3%83%AC%E3%82%AF %E3%82%B7%E3%83%A7%E3%83%B3