Karen and Mizuki are inseparable mates which have recognized one another since their early childhood. In the future, Mizuki was approached by Clio, a well-recognized to grow to be a magical lady whose responsibility is to combat magical beasts and shield the world. Mizuki is injured within the technique of combating such a beast and Clio provides Karen a contract to combat alongside Mizuki as a magical lady. Will Karen settle for the supply?