The Magical Revolution of the Reincarnated Princess and the Genius Young Lady, Vol. 6 (manga) — Piero Karasu

Algard Von Palettia, the prince of the kingdom of Palettia, is Anisphia’s brother and the sole inheritor to the throne. But in a kingdom where royalty and nobility is determined by one’s aptitude with magic, Algard has grown disillusioned—with his sister, with magic, and with the world. The two siblings shall finally clash in a battle over their hope and despair for the future!