Also khown as:
Demon's Sword Master of Excalibur School
Seiken Gakuin no Maken Tsukai
Мастер демонического клинка из академии «Святого Меча»
Seiken Gakuin no Makentsukai
Magic Sword Master of Holy Sword School
One of the most powerful demon lords ever has been sealed away for a thousand years. When he finally awakens, he is reincarnated as…a 10-year-old boy?! Now under the care of the girl who released him, the demon lord Leonis must navigate the perils of Excalibur Academy!
(Source: Yen Press)