When I first saw the anime version of this, I felt like I was only seein the surface of a deep and rich universe. There is so much going on there far beyond what we are treated to on screen.
Gunparade March has a similar effect - the war is the background setting for the romance story - but Crest/Banner has a great deal more to it. It's like the creators were intimately aware of the universe their characters lived in and new exactly how it worked.
I’m rambling a bit, but I found out today that Crest of the Stars is going to be released in novel form in a couple of months and the thought of getting lost in a world only an expertly written novel can present excites me. I wonder how it will translate into English. I also wonder if it truly the original novel translated into English or just a novelization of the anime.