The Irregular at Magic High School, Vol. 1 (light novel): Enrollment Arc, Part I

It's been a century since magic stopped being the stuff of fairy tales and became a practical technology. Siblings Tatsuya and Miyuki Shiba have both been admitted to a prestigious magical prep school--and while Miyuki's excellent entrance-exam scores qualify her to be part of Course 1 (a "Bloom"), Tatsuya's poor performance relegates him to Course 2 (a "Weed"). Tatsuya's going to need every bit of clever thinking he can come up with in order to keep both himself and his sister safe in a place where the students are learning to manipulate reality itself!