miya is the heroine of this world, and this world theres monsters and demons and magic miya's parents was killed by the demon lord so she wants to enslave the demon lord to be her pet the demon lord's name is lily and miya is a  brat tamer she punishes brats sadisticly but when the brats behave she becomes the nice and sweet miya she attends a magic school she attends class on time when the bell rings shes sadistic when punishing brats but and punishes in private when shes done she turns sweet