Kyuutei Majutsushi no Konyakusha: Shoko ni Komotteitara, Kuni Ichiban no Tensai ni Misomeraremashite!?

Also known as: 宮廷魔術師の婚約者　書庫にこもっていたら、国一番の天才に見初められまして！？

by Saho Mikuni, Harumi Haruno

Melanie, a member of the prestigious Stewart family, is a "dropout" with little magic power. When her engagement is called off because of her lack of magical powers, she finds herself in the library, where she succeeds in deciphering an ancient lost language! However, when her uncle invites her to a magic school, Quinn, the best court magician in the country, discovers her hidden talent...? (Source: Kadokawa, translated)