This deserves a speeding ticket. Everything is blazing fast. Gets resurrected into a a boy who has been alive for 12 years, does not know anything - boom, next day knows virtually anything about him and the people around him, somehow without asking many (if any) questions. The next day gets a theoretical lesson on magic, goes to borrow a grimoire and starts shooting magic right away. And in just a couple of days - without a grimoire and without incantations.
Then like a week passes, he meets a guy, that's supposedly a notorious criminal (that he does not about, even though he learnt everything about the world already), and he becomes his teacher and within an hour or two her is able to shoot 3 magics at once and gets a ring that has all the grimoires (I know it's not "all", but does he even needs others?).
The his elder brother wants to hinder his progress, but somehow he gets what he wants - independence. Which is doubled by another guy (king?) who grants him knighthood for... Being student of that notorious criminal? And he also enslaved 2 girls already after becoming a B-Rank hunter (just because he can shoot magic). All at the age of 12, and within like 2 months? Oh, and he also gets extra free gold, an item box and a bigger item box for people. Let alone the opening suggests he will get at least 12 cute maids (although half of them look like clones).
I get it, that he is supposed to be OP, but this is going too far. There is no challenge whatsoever. Feels like a feverish dream of a 5-year-old, who wants life to be on easy mode, but that does not make a good story.
