Nanatsu no Maken ga Shihai Suru

Reign of the Seven Spellblades is an adaptation of a novel series by Bokuto Uno, creator of Alderamin on the Sky. I read the manga first, then the novels, and have been waiting for this series for over two years.

This world is heavily inspired by the Harry Potter series, but with a lot of its own twists to make it distinct. This is not an action-comedy like the contemporary Mashle: Magic and Muscles; rather, this is more of a teen drama in a dark fantasy world, focusing on a core friend group of six students at a highly prestigious and very dangerous magic school, and particularly the romance between Oliver Horn, a jack-of-all-trades who is much more than he lets on, and Nanao Hibiya, a former samurai plucked from a battlefield in the Far East.

If you're looking for instant gratification with an OP MC, this is not the series for you. This is long-form, highly serialized storytelling that takes its sweet time establishing the world and the characters. And it's an enchanting world. It sucks to live in, but those who want to make it suck less have real support and are slowly making progress. But the old order isn't going to go down without a fight.