First off the setting and world building: 9/10
Starts of quite generic, with your MC/hidden past/tsundere female/academy setting but it grows, through a wonderful web of story telling into a huge world backed by solid lore and understanding. When you read this series you can feel that the author has invested himself into developing the setting and building his world.
The story: 8/10
Very solid story, building on from the setting and lore framework, the author does very well to draw you in and make you believe in the story. You're invested, you want to see what happens next and whilst its not the most original story line ever, the execution is done very well.
The writing style: 6/10
I don't know if this is the writing style or just the translation but sometimes it feels a little childish. Chances to develop the readers understanding of what the background looks like are occasionally missed and there seems to be a general repetition of metaphors the writer uses. I can only imagine that the writer or translator has a 'metaphor bank' of 10-12 metaphors which they like to draw on throughout the series.
The characters: 10/10
Okay 10/10 would bang them all. Haha okay seriously though, the dynamics between the MC and his girls are well developed and we see each character get their fair share of development. But all this technical crap aside (I don't want to be some uptight anime connoisseur), I genuinely loved the characters and the reasons for this are tied to the philosophy of emotional attachment. They are, at some level inexplicable.
Enjoyment and Overall: 10/10
Loved it.
