This is a pretty normal shounen, not unique. It quickly becomes very repetitive, with the main character facing off against a new enemy, then defeating them using some combination move we've never seen before. Not for people who want complexity or depth.
It seems really overhyped given how high it's scored.
If you're interested in art, the art is fine.
The characters are unremarkable, and I've already forgotten about them. The main character is a boy who loses his sister, and then has to fight demons. He fights bigger and bigger demons as the show goes on.
This is probably for 10 year olds who like to see fights.