On a summer day, Takeshi Nanase has a sudden revelation that the world he knows is only part of the full picture. While heading to kendo practice, he stumbles upon an unconscious girl in uniform and, in a selfless act, saves her life. This transforms him into a magic user, exposing him to a parallel world where magic users coexist with those without magical abilities. However, not all magic users wish to live in harmony with the non-magical. Mui Aiba, a powerful magician with grand aspirations, enrolls in the Subaru Magic Academy, which Takeshi and his friends Kurumi Isoshima and Kazumi Ida soon follow suit. Each of the trio has their own reasons for fighting, whether it is to escape their past or catch up with the future. Despite their diverse motives, they share the goal of honing their unique magical abilities to defend against the Ghost Trailers, a group of magicians who seek to dominate humans through violence. As they are relentlessly pursued by the Ghost Trailers, Takeshi and friends must push themselves to the limit in order to confront the group's leader and prevent the start of the Second Great Magic War.