Hidden somewhere beyond the highest clouds is the castle of Destino, a school for very special students.
They're the Melowies, little unicorns born with a symbol on their wings and a hidden magical power. The Melowies finally start the Art of Powers class which teaches them to strengthen the power they were born with.
Clio, having been left at Destino when she was born, does not know the realm she is from and does not know what her power is.
She must take lessons in all of the realms in order to find out which she belongs to. Meanwhile, can she stop whoever is sabotaging her friends in class?