Takeshi's dark past isn't window dressing, it's the reason he can't refuse when magic intrudes on his ordinary life. The show moves slowly enough to let you feel the weight of that choice, then rushes to show you everything it costs. It's built for people who want their shounen to hurt before it excites, even if the execution sometimes stumbles getting there.
Takeshi Nanase thinks he knows his life: high school, a fake dating arrangement with his childhood friend Kurumi, and nothing particularly remarkable. That certainty shatters when Mui Aiba collapses on campus in an unfamiliar uniform. She's a magician, and in her panic, she's accidentally transformed Takeshi into one too. What he believed was a single reality fractures into two. Humans walk through their ordinary world unaware that magicians operate in secret alongside them, wielding power and fighting battles invisible to normal eyes. Now dragged into this hidden conflict, Takeshi has to grapple with newfound abilities he didn't ask for while caught between both worlds. Mui becomes his reluctant guide, but joining the magical society isn't simple or safe. People want to use him. Others want him dead. Takeshi must figure out what kind of magician he wants to become and where his loyalties lie, all while the conspiracy surrounding his transformation deepens. His dark past might hold answers he never wanted to find.