The year is 3000 where magic is common place. Transferring to the Constant Academy of Magical Arts just as the new quarter begins, Sai Akuto hopes to become a High Priest. But during his aptitude test on the first day, the artificial spirit Yata-garasu says that he's destined to become a "Demon Lord"! So now Hattori Junko, who he'd sworn an oath of friendship with earlier that day, challenges him to a duel. The duel is interrupted by a girl named Keena as the misunderstandings get worse and worse!
Akuto, potential future Demon Lord, begins his days of trying to fix these misunderstandings!