2,000 years ago, Anos, tired of war, made a deal with the human hero Kanon to sacrifice his life to separate the Demon, Human, Spirit and God realms for 1,000 years so peace could flourish. In the present, Anos learns he was deemed a misfit because the history of the Demon King has been grossly misinterpreted. He proves his intelligence by correcting the spell of his teacher, Emilia Ludowell, doubling its power. He then proves his power by overwhelming Sasha Necron, Misha's arrogant sister, with her own spell. Sasha challenges Anos to a duel in the team exam. If Sasha loses, she will join Anos' team, but if Anos loses, he becomes her slave...