Oujisama nante, Kocchi kara Negaisage desu wa!: Tsuihou sareta Moto Akuyaku Reijou, Mahou no Chikara de Mikaeshimasu

Cecilia is a former noble exiled from her country after the crown prince broke off their engagement on top of making some false accusations. She flees with her mother to a neighboring country, Theophilus. Hiding her identity, she makes up her mind to survive even if it means living a poor life. Just when she settles into the commoner lifestyle, Albert (her childhood friend and the crown prince of Theophilus) appears before her?

(Source: Kill Time Communication, translated)