Based on a light novel of the same name written by Satou Tsutomu and illustrated by Ishida Kana.

In a world where magic is a product of neither legends nor fairy tales, but has become a technology of reality for nearly a century, various countries in the world are locked in a race in nurturing magicians, practitioners of modern magic. For that purpose high schools, called Magic High Schools, were nationally established. At First High School, the first of its kind, located in Hachioji, Kanto, Tokyo, an elite school where the most excellent magicians are fostered; two hundred students are divided into two courses. With the students of Course 1 excelling in magic, whereas the Course 2 students are only seen as replacement for those. The difference between the two results in discrimination of Course 2 students, so-called Weed by Course 1 students, called Bloom.

In the spring of the year AD 2095 two magicians enroll in First High School. Shiba Tatsuya, an honor student without magic capability, who was barely accepted into Course 2, along with his sister, Shiba Miyuki, who happens to be the top student among the freshmen in Course 1. In this environment where students are divided into elites and plebs right at the enrollment and discrimination is running rampant, what will happen to the irregular at magic high school.