Princess Tutu tells the story of Ahiru, a seemingly ordinary girl who is actually a duck transformed into a human.
She discovers she can transform into Princess Tutu, a ballerina whose dances can heal people's hearts.
Her mission involves collecting pieces of her prince's shattered heart, scattered after he made a sacrifice to defeat an evil raven.
The anime explores themes of fate and the choices characters make as they strive for a happy ending in their fairy tale world.