Karen and Mizuki are inseparable pals which have identified one another since their early childhood. Sooner or later, Mizuki was approached by Clio, a well-known to change into a magical woman whose obligation is to battle magical beasts and defend the world. Mizuki is injured within the strategy of preventing such a beast and Clio gives Karen a contract to battle alongside Mizuki as a magical woman. Will Karen settle for the provide?