The art is okay, story a little dumb but ok, character super dumb other than the mc that is dumb as well.
They will give some dumb excuse to why the magic decrased, like demons invading human goverment and making everyone dumb because countrys live in eternal peace blah blah blah, wich in real life don't make sense with countrys stregnth themselfs no stop.
The harem thing make me sick of how forced it is.
Mc lack common sense despite being a "sage" and the other sages must be as dumb to let it happen or they did it.
Anyway, plot lack sense, characters lack personality, same cliche, nothing new and predictible mc.
6/10 and idc if you don't have the same opinion as me :V