Brundage no Mahou no Shiro
ブランデージの魔法の城
An ex-prince named Donatian Charles, known for his arrogance, seeks a son to inherit his magical abilities. To achieve this, he takes a girl named Adrienne from a nearby village. Initially puzzled by his sudden marriage proposal, Adrienne eventually grows to love him. The story explores the complex and turbulent life that unfolds between the two during their engagement.