After the death of her parents, a 12-year-old girl named Mia Marconi is gifted a game that her father had made in life, taking the form of a large book called The Legend of Centopia. Inside is magical runic writing and a password, which when read backwards, allows Mia to travel to the magical world of Centopia. The land is filled with mythological creatures, including: winged elves, pans (goat-like creatures), unicorns and dragons. While in Centopia, Mia changes into a winged elven girl with the unique ability to talk to unicorns. She meets and befriends a cast of magical characters: a unicorn named Lyria (and, later, Lyria's winged son Onchao); Yuko, a girl warrior who is a little jealous of how much attention Mia receives from Prince Mo, and Phuddle, a comedic pan.