Okay this is what I can say about the manga so far...
I originally watched the anime first and I thought to myself, it's okay.
Character development was weak, story progressed way too fast, but the plot concept was good; keep in mind that I am talking about the anime adaptation.
Since I didn't read the original light novel version,because I have like no way of reading it, all I can say about the manga is that it is WAY better than the anime.
The character development gets better.
In the anime we just see cecily as a weak girl who gets lucky in her fights basically.
In here we see
her transform, we see how she trains to master her swordsmanship. We also see the progression between Cecily and Luke and how the two feel towards one another. So unlike the anime adaptation on the light novel, the manga adaptation is way better.
The character development is at a steady pace, and the way the story develops is once again better than the anime adaptation. So for all of you that saw the anime adaptation, give the manga a chance, and if you happen to find the english translated versions of the light novel online please give me call, for I can't stop reading the manga, and now I am curious as to how the light novel is different.
(PLEASE BARE IN MIND THAT THIS IS MY PERSONAL OPINION AND THAT THIS PARTICULAR MANGA APPEALS TO MY TASTE)