The irregular at magic school

The series is set in a world where magic exists and has been utilized as a technology for
nearly a century. Rather than casting spells with chants or other traditional forms of spellcasting, mages use a Casting Assistant Device, better known as a CAD. Mages
infuse the CAD with psions or thought particles (a substance-less particle and
psychic phenomenon) while the CAD itself provides an activation sequence, which is
then used to construct a magic ritual in order to invoke the magic. This magic ritual
targets the Idea, the platform on which Eidos are recorded. Eidos refers to a form of
information that is attached to a phenomenon. Modern magic uses false signals to
manipulate the Eidos of a target, which in turn modifies the phenomenon and causes
physical changes in the real world.
In 2095, Tatsuya Shiba and his sister Miyuki Shiba are new students enrolling at the
Private Magic University Affiliated High School (First High School). Students are
ranked according to their test scores: students with the best grades are designated
"Bloom" and enrolled in the Course 1 curriculum, while those with poor scores are
designated "Weed" and enrolled in Course 2. Miyuki topped the entrance exams and is
selected to be the first years' representative, while Tatsuya is placed in Course 2
due to his low practical test score, despite scoring the highest in the written
portion of the exams.