Kon'yaku Haki Sareta Karen Reijou wa, Teikoku no Koushaku Kishi-sama ni Dekiai Sareru

https://www.cmoa.jp/title/298720/

Lilianne has her engagement to her childhood friend Prince Adrian of the Kingdom of Pertier broken off without warning. Cast out to a remote villa on the frontier, she meets Fernan — the Second Prince of the Yultis Empire. Despite the tragic events of her past (the loss of her real parents, mistreatment by her stepfamily, and lack of recognition for her talent in light magic), Fernan is struck by her and promises to “come back for her.” When they meet again months later at a welcoming party, Fernan publicly proposes to Lilianne in front of everyone — starting a new chapter filled with devotion, duty, and unexpected romance.