Rune Majutsu Dake ga Torie no Fubin Reijou, Tensai Ouji ni Dekiai Sareru: Konyakusha, Shigoto, Seika mo Subete Ane ni Yokidori Sareta Jimi na Imouto Desu ga, Aru Hi Totsuzen Tachiba ga Gyakuten Shichimashita

Mayanna, the daughter of a marquis, comes from a family renowned for magic, but is a failure who can only use outdated rune magic. What's more, she is overworked by her older sister, a talented magician, and even has her fiance taken away from her, making her a pitiful victim. Then, one day, Prince...

Source: MyAnimeList