Sometimes a VA's performance as a character they do not play can carry the show, and Blade Dance did it for me. I personally thought that LN (or what little I've read of it) is generic harem as heck, and the series is no different. But Hikasa as the teasing and slight yandere-ish 'antagonist' Restia? She really brought out the character for me, to the point where I was gladly drudging through each episode just to see a second or two glimpse of her. Oh yeah, the faces Kamito puts out every time he meets Restia face to face are both amusing and heart breaking at the same time, so there's that too.
So if you told me at the beginning of the season that Blade Dance would be one of the series I'd finish that season, I'd say you were crazy, especially with Aldnoah making other shows look worse than it actually is. But here I am; while no means a masterpiece, or heck I wouldn't even call this a 'good' series, I still finished it. XD