The official website is here.
http://www.marine-e.net/sp/eustia_ia/
Also, the opening theme for Aiyoku no Eustia is "Asphodelus", which is nowhere to be found on the album. That portion of the notes has been deleted. From what I can see on the main website, the large majority of this album consists of theme songs from the drama CDs released for the game itself.
Ushio, next time try to include the homepage of the album itself. Shopping pages are good, but they don't always give all of the information we need.