Cuocuo Lin

Cuocuo is the protagonist, a 13-year old middle school girl who gets transported to the magic world after making a contract with the Phoenix Fairy. She is the first chosen child destined to save the world.

Although she is thirteen, her body reverts back to three years old while in the magic world due to the contract with Phoenix. Cuocuo's body ages back up or further down based on the amount of magic Phoenix uses.