Her mother was overbearing and proud and expected Sherry to be perfect as a child, constantly expressing disappointment and disgust with her when she failed. As a result, Sherry grew up very unhappy and ultimately tried to commit suicide by throwing herself into a raging river. She was rescued by Koko, who told her it was important to remain alive to find happiness in the future. The two quickly became best friends.
When Sherry and Brago fought against Zofis and Koko, Zofis caused Sherry to believe that Koko had willingly turned against her, causing her determination to falter and hindering her ability to cast spells. While they almost lost, Sherry's belief in her friend prevailed and the two were eventually able to win. After burning Zofis's book and restoring Koko's heart to normal, Sherry vows to make Brago king in gratitude.
