The Demon Sword Master of Excalibur Academy - S01

The war against evil is almost over. The Undead King, Leonis Death Magnus, is the last of the Dark Lords left standing. Realizing he can’t win alone, he seals himself underground, planning to reawaken a thousand years later to rebuild his demon army. But when he finally revives, the world is unrecognizable. The great war that led to his downfall is long forgotten. Now, humanity faces a new enemy-the monstrous Voids. Magic has faded, replaced by advanced technology, and warriors known as Holy Sword wielders train at Excalibur Academy to fight the creatures. Reborn as a ten-year-old boy, Leonis is discovered by Riselia Ray Crystalia, a kindhearted girl who mistakes him for an amnesiac. She takes him under her wing and enrolls him at the academy. Though Leonis still dreams of world domination, he first has to adapt to a future nothing like the past he remembers.