Shikkaku Mon no Saikyou Kenja

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"* Based on a fantasy light novel series written by Shinkou Shotou and illustrated by Kazabana Fuuka.

His strength limited by the magical crest with which he was born, Mathias, the world's most powerful sage, decides reincarnation is necessary to become the strongest of all. Upon his rebirth as a young boy, Mathias is thrilled to discover he's been born with the optimal crest for magical combat on his first try! Unfortunately, the world he's been born into has abysmally poor standards when it comes to magic, and everyone thinks he's still marked for failure! Now it's up to Mathias to prove everyone wrong...world's strongest sage-style!

Source: Square Enix"

Genre(s):Fantasy

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Isekai was a mistake. This isn't technically isekai, but so similar it doesn't matter. Boy is reborn OP in magic and goes to adventurer school where he makes waves and exposes a demon plot of a hundred or so years to make human magic weaker. Check back in about 5 more episodes when there is a possibility that this has formed an original concept.