The Demon King's Sister

A prophecy said that the half-blood Demon King and the legendary Hero would fight their final battle, deciding the fate of the entire continent. But the prophecy forgot to mention that the Demon King had a beautiful older sister. Hero: "Your Highness, want to go out?" Leipins looked up from her desk and frowned, looking a little troubled. "I haven't finished my herbalism homework, so... You're a good person, classmate. Really." A friendly reminder: A plot-driven, top-student leveling-up story. The gentle heroine is determined to become the greatest mage on the continent. Reader advisory: The Demon King is a yandere seme, and the Hero is a devoted but manipulative uke. Neither of them is remotely sane. The Hero is the male lead, and the younger brother appears in a supporting role. If that's not your thing, read with caution. This story will be locked for paid access on Sunday, August 14. Three chapters will be posted that day. If you'd like to follow the heroine and her friends on their academic journey, please keep reading! WWWWW Thanks to the cover artist, leafyanna. Theme: