In the gray city of Rio de Janeiro lives a young girl named Mima. She is a teenager who does everything possible to hide her strange ability for hyperempathy in a world where there is no magic. However, while participating in an important competition, Mima encounters a problem that causes her to lose control over this mysterious gift. As she distances herself from her companions, the girl unleashes a spell spoken 300 years ago. With the help of this spell, she awakens three witch guardians.