Sent to Earth during her early teens, Megu is adopted by Mammi Kanzaki, a former witch who abandoned her royal ambitions to marry a mortal. Mammi casts a spell on her husband and their two children, Rabi and Apo, making them believe that Megu has always been the family's eldest child. Under Mammi's guidance, Megu learns to control her abilities and impulses to prove her worthiness for the crown. This rite-of-passage subtext persists throughout the series.