A century after magic returned to the world as a codified, teachable science, Miyuki Shiba enrolls at First High alongside her older brother Tatsuya. This spin-off retells the events of The Irregular at Magic High School from Miyuki's point of view. It follows her rise among classmates like Shizuku Kitayama and Honoka Mitsui, and under seniors like student council president Mayumi Saegusa, as she works to live up to the school's honor-student expectations and to protect the brother she's fiercely devoted to.