There's a fine line between familiar and slave. Louise Francoise Le Blanc de La Valliere, nicknamed "Louise the Zero" because of her terrible magical skills, has just reaffirmed her title. Instead of summoning a fierce mythical creature to be her familiar, during her second year exam, she gets a human instead! This human familiar is named Hiraga Saito, a normal teenage boy from Tokyo, who was plucked from his home and inducted into magical servitude. Now he's stuck with a master he has no idea how to serve and with magic neither of them know how to use. But for better or for worse they're forever bonded and the quicker they learn how to work together the higher the potential of them graduating from this academy.