Return of the Princess Twins (episode)

Plot

During her visit to the Chateau of Yesterday, Celeste learns she is the long lost princess of the Night World and the biological daughter of Queen Dume, who abandoned her on the same night she kidnapped Eve and killed Luna. Having to remember that awful night causes Celeste to cry, the spirit, taking the form of imp girl and showing the shadows of her past, encourages Celeste that she was outshined by Eve the majority of her life and to take the Dawn and Dusk amulet to claim her destiny.

To where we left off, Dawn, Eve and their friends are horrified Celeste betrayed them and she is Dume's daughter. Eve tries to console Celeste but she refuses to listen and after a chase, breaks the bridge to the Dawn and Dusk Castle,