【Manga Adaptation Decided】Thank You for Plundering Me

Leonora was undergoing harsh education as a fiancée to Crown Prince Theodulf, but she realizes that the queen's unreasonable scolding means the education is merely part of mother-in-law harassment. Meanwhile, her childhood friend Marianne, who covets everything of Leonora's, steals away the crown prince, resulting in the breaking of their engagement. However, the liberated Leonora is delighted, and becomes newly engaged to Duke Cedric's son. Cedric is an eccentric man absorbed in magical theory... *Also posted on other websites