Imouto ni Konyakusha wo Ubawareta Ochikobore Reijou wa, Tensai Majutsushi ni Dekiai Sareru

Iris is a dropout in a family of magicians who cannot use magic. When her fiancé is stolen by her sister and Iris is forced to leave home, she finds work as a maid at a certain house. Soon after believing that her new life as a maid would be more peaceful than as a dropout, for some reason, her master, an extremely beautiful genius magician, takes a liking to her...

(Source: MangaPlaza)