Leonis Magnus

Once a fearsome ruler who made the entire world tremble beneath his name, this sovereign of the undead willingly sealed himself away in preparation for a final, decisive battle—only to awaken a thousand years later in the unexpected form of a ten-year-old boy. Rescued by Riselia, he enrolls in Holy Sword Academy, concealing his true identity as a Demon Lord while fighting the 'Voids' that threaten humanity, all the while quietly searching for his former subordinates and laying the groundwork to resurrect his demon army in an unfamiliar modern era.