In a magical world called Halkeginia at the Tristain Academy for magicians, Louise Vallière heads to class on her first day as a second-year student. Her teacher asks her to perform a simple spell: to change pebbles into brass, though her peers mock her with the nickname "Zero". As soon as she casts the spell, the room explodes. Despite being from a famous magician family, Louise has a "Zero" percent success rate casting spells...