A red-haired juvenile boy, Nacht, suddenly appears at the Kielmor Academy of Magic, where the Seven Demon Sword Princesses reign supreme. “This school has the Seven Demon Swords, right? I’ve come to take them all.” As soon as he moved in, this fearless young man made enemies with the entire school. His goal: to obtain all of the Demon Swords and to revive the legendary Knights. Naturally, classmates Charlotte, Aria, as well as the other Demon Sword Princesses, could not overlook this— “How do I put this? You’re extremely beautiful.” “D-Don’t stare at me like that. You’re going to pay for this.” The legendary magic tools that Nacht possesses; the Knights that surround the flying island, the threat of roaming demons around the continent—the battle between the young man and the Seven Demon Sword Princesses, involving the entirety of the huge Academy, begins!