The story is all about that guy who loves someone and end up with a harem to fight a great evil, the big point of the manga isn't there, although the story you will, probably, get excited every time character make a move towards their relationship, the fights feel misplaced and weird, sometimes the enemies are incredibly strong sometimes they die with a single clumsy hit and that makes the fights feel meaningless.
The art is weird it sometimes looks clumsy but it is beautiful even at those times, for a world on the edge of annihilation everything looks bright, light and beautiful.
The characters are shallow, the main character is a gentle guy who will do everything to protect the love of his life "his childhood friend" just like he protects anyone, the princesses kinda lose their personality when they get near the main character, the princess of light probably have dissociative identity disorder, going from jealous to complacent to supportive in the same page.
Beside the character and the inability of supporting one the harem girls I found it quite enjoyable watching their relationship "try to grow".

I would recommend this manga if wanna see pretty couples or a beautiful art.

I wouldn't recommend this manga if want great fights or a character that you will fall in love and remember forever.