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It follows Louise Françoise Le Blanc de La Vallière, a self-absorbed mage in a world of wands, cloaks, and royalty. She is at a prestigious school for magicians, but is unable to cast magic properly, earning her the nickname of "Louise the Zero" from her classmates.

It’s tradition for the first years to perform a summoning ritual which obviously ended in a explosion when Louise tried it. Instead of summoning a animal, she summoned human from a different world, Saito Hiraga.