The art is simply gorgeous, the girls are super cute, but that's all.
No actual scenario, even the slice of life is boring as you don't feel anything for any character, and weird reactions from characters to sudden appearances and magic.

The only "mature" thing about this is the fanservice. As for other stuff, the jokes are just ridiculously childish. Things like a tribe where you punch males and hug females when you apologize to them. Come on, what is that clan made up of, hardcore masochists? So stupid. Even the basic setting of a demon king that somehow grows big when she eats food is moronic(although I could accept that much if that was all). I guess it's about there being insufficient magic power on earth and thus they get that power from food or something, but it's still stupid and never properly explained. Also, it seems that no one has even a slight reaction about magic, none at all. Summoning, turning into a cat, talking swords etc, yet no one comments about it as if it's natural on a supposedly "normal" earth(by normal, I mean it seems no one knows about magic).

The cases in which it made me laugh were very rare, it mainly made me cringe at how childish it was. Truly an average work through and through. It's readable and enjoyable at times, but it's never "great".