I'll keep my review short, because I don't want to waste any more time than necessary on this anime.
Story: 3
Art: 9
Sound: 9
Character: 3
Enjoyment: 5
Overall: 6
In short, it had a great soundtrack and amazing artwork, but those were the only things I liked. It was eye-candy or fan-service with no substance. (Don't get me wrong — there is no actual "fan-service")
It started off really well with a cool (yet generic) idea, brilliant art and music, great suspense and excitement-building, and decent character concepts, but then it just went downhill from there. When it really got bad was when the show's main antagonist arrived. Basically, as soon as they tried to introduce a real plot, things went south. Also, the characters gradually became less and less likeable the more you got to know them.
It looks like they're setting things up for a second season, but I, personally, do not want one. That's not something I say very often...