Ikuko Itoh Ordre des livres (chronologique)

Ahiru studies ballet and dreams of one day becoming a "prima ballerina." Ahiru also has another desire - a certain young boy named Mytho. When a mysterious woman gives Ahiru a magical pendent, a whole new and fantastic world opens before her, a place where Ahiru becomes the ever-so-graceful Princess Tutu! Ahiru learns that Mytho is really a prince whose heart has been stolen, and her mission is to find the missing pieces. Princess Tutu is a beautiful fairy tale where Ahiru gets to live every girl's fantasy.

Ahiru's transformation into Princess Tutu is hindered by an envious Princess Kraehe who is determined to thwart Ahiru's efforts to win the heart of her prince.