Mia have a gift for her father : a magical book. With she can go to Centopia, a world of unicorn. She become friend with Yuko and Mo at Centopia and help them for fight Panthéa.
When a dark force threatens to destroy Unicorn Island, brave teenage princess Astrid Granger and her five schoolmates must rebel to protect their beloved magical academy and face the evil wizard Lord Vexius.
