Description:

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)

Alternative Titles:

聖剣学院の魔剣使い, Seiken Gakuin no Makentsukai, Magic Sword Master of Holy Sword School, Demon's Sword Master of Excalibur School