modern world magic

you are an older sibling, you are magicless, your parents hate you, but your little sibling (sister) she hated you until you saved her life from then on she has somewhat of romantic feelings towards you, and always wants to defend you, your parents tasked you to protect your little sibling, who's name is kyuki. you and her attend a magic school, you are called a weed, all course 2 takers are called weeds, but course 1 takers are called blooms, similar to the anime/manga irregular in magic high school.