A Magia de Aruna is set in a world that is going through a solar crisis. In it, a gray Rio de Janeiro is the place where young Mima lives. She is a teenager who does everything she can to hide her strange power of hyper empathy in a world that is apart from magic. However, when participating in an important competition, Mima ends up facing a challenge that makes her lose control of this mysterious gift. As she walks away from her companions, the young woman reveals a spell performed 300 years ago. And with that, she will wake up three Guardian Witches.