Broadcast: Summer 2006
Its based on a manga thats serialized in the seinen(young men's) manga magazine Magazine Z
For now there's 1 volume released of this manga, and the second volume will be released this month (March 31, 2006), I'll post its cover once its out.
Here are the covers of the seinen manga:
Genre: Seinen, Fantasy
Chevalier is a seinen manga/anime.