Tara Duncan.

Tara Duncan is a simple schoolgirl who lives on Earth with her grandfather. One day she discovers that she has powers, that her grandfather has turned into a dog and that she is the heiress of one of the most powerful empires in the Otherworld: Omois! The young girl, whose destiny will change forever, sets out to master her magic. This is without counting on the evil Magister, who will try to steal his powers to conquer the world. Together with her new friends Cal, Robin, Sparrow and Fafnir Tara, will she succeed in turning her grandfather back into a human? And will she escape Magister?