Louise Valliere is a noble attending the Tristian Aademy of Magic as a second year. She is known as "Zero Louise" by her fellow classmates for not even being able to perform magic. At a special ceremony in which you recieve your familiar partner, Louise summons a boy, Saito Hiraga, from Earth. She treats him badly by whipping him constantly for misbehaving or having perverted thoughts. But unknown to them tension buids up in the kingdom of Tristian agenst Albion, which leds them to discover both of they're hidden powers through many tests and challanges working together as equals, and bringing them closer together.