This is the original album to the manga of the same name. Seems weird to me that this never got any sort of CD treatment---I mean, Hiromoto Tobisawa, Shiro Sagisu, and Nozomi Aoki as arrangers in the same album? That alone should say a lot about the quality to expect from this album :)
I was even hoping to find a Japanese blog page about this album, but nope...nothing. I guess it's really obscure.