Overall verdict: Meh and that's it?
All that I understood about his secret was that it had to do with his aura or something.
I wanted to learn more what he's angsting about, but instead I get chapters of him just showing how badass he was (which was okay at first, but weren't particularly interesting) and then getting involved in some terrorist plot, and the manga was OVER. Like, wut.
Interesting take on magic, but has a tendency to info-dump (show, not tell). Despite not being ecchi, I was mildly miffed by the unnecessary fanservicing, especially that one random chapter at the beach (I think it was an extra, so that somewhat forgivable). The discrimination aspects were overdone, in my opinion. Rather cliched in its presentation. Subtler would have been more effective and truer to real life.
BTW, to the person saying read the novel. Screw that. I'm here to read a manga, not a novel. I'm rating a manga here, and not a novel. If the manga fails to deliver without support from an outside reference, be it novel or anime, it fails as a manga. Maybe the novel is a million times better, but the manga still sucks and cannot stand on its own.
EDIT: If I didn't like the prequel, I don't think I even have the inclination to read the sequel. Even ignoring the fact that nothing was really resolved, I would have been less upset if the plot of this "arc" was actually interesting and added to the overall story. There was really no point other than having the characters show off and hint at some evil organization. Yawn Been there, done that. Unless someone manages to convince me the sequel isn't the same boring teasing bull, I've got better things to do.