Onchao is a small and very cute Unicorn foal. He is innocent, cuddly and helpless, inspiring protective feelings in others.
Like all Unicorns, Onchao is quite a handful – it seems impossible to babysit him. But Onchao is a special little Unicorn: he has a budding pair of wings, and a Golden Horn. With the Golden Horn he can regenerate decaying environments.
12-year-old Mia finds herself hurled into the wondrous world of Centopia, full of elves, unicorns, pans and dragons. But the once idyllic kingdom is in danger. Evil Queen Panthea seeks to capture the unicorns and harness their power to keep her self young. The valiant elves, led by Prince Mo and daring warrior Yuko, fight to stop her. Thanks to her unique ability to communicate with unicorns, Mia must safeguard the golden-horned Onchao. As Mia bounces between trying to fit in at her new school and her life as a fairytale elf, she becomes the key to saving Centopia.