Archfiend's Academy Playbook

Slain as the so-called Demon King, the Archmagus Xylos opens his eyes twenty years later as Zane— a scrawny, magicless commoner in the very city that worships the “Hero” who killed him. In a world where easy, affinity-based magic from the Light God has replaced true power, Zane’s new body has zero mana and a trash-tier fire rating… but he still remembers everything: forbidden blood magic, true names of demons, and the loopholes hidden inside holy spells. Enrolling in Solara Grand Academy as a nobody in the failure-filled F-Class, he plays the role of weak, harmless peasant while dissecting the system built to hunt monsters like him. Bullied by nobles, watched by war-veteran professors, and ruled over by his old nemesis—now the beloved Headmaster—Zane uses his “worthless” magic in terrifyingly clever ways, quietly building allies, bending exams in his favor, and probing the mystery of who reincarnated him. This time, he won’t charge the world head-on as a Demon King; he’ll dismantle it from the bottom of the Academy up.