Huh? There's a magic school here.

In 2026, Earth was attacked by magical beasts from another world. Lynn, then middle-aged, was forced to join the ranks of those defending his homeland. Tragically, he perished in a beastman raid and awoke to find himself in England twenty years earlier. Reborn as Andres Morrie with a whole set of cheat codes, he had a chance to save Earth. Years later, he not only saved humanity but also led them to conquer the other world. He was known to humanity as: Marquis of Paradise Island, Founder of Hogwarts, Guardian of Humanity, Conqueror of Another World, and Archmage. (This is a system-based story; the early stages focus on building Hogwarts and training wizards, while the middle...)