Ochikobore Reijou wa, Koushaku Kakka kara no Dekiai ni Kizukanai: Konyakusha ni Shimei Sareta no wa Saishokukenbi no Ane de Hanaku, Watashi deshita

Noa is a girl born into the prestigious Ailnots family, but was not blessed with magical talent. Sick of being called a 'failure' and being harassed by her superior older sister, Noa has retreated into her room with her only friend, Haku, a high-ranking spirit. Then one day, Noa and her friends receive an invitation to a party from the Dukes of Estark, the birthplace of Van, a prince who is highly respected even by the royal family, and her destiny begins to change..! Source: MU