Premise is good. Too bad the origin story of the two sides was never explained in the first cour. I suppose the studio was gunning for a second season, but I would be really surprised if they get one, so this anime will probably leave us hanging forever. Also unfinished are at least three of the five possible harem routes. That means that most of the enjoyment of this anime must come from the battles because the world and the romances remain woefully incomplete. I do like the battles, though, so I did watch all the way till the end. The ending song Colorful Wing is great too,perhaps the only thing that will stick with me.