Yuu Urata

A group of mysterious white-haired children has been spotted at different times and places in Europe for over 500 years. Always with the looks of 11 years old, they behave way more mature than they should be, never grow, and seem to have supernatural power. What they have kept being after is a girl, and all the connection they have is a picture with a crescent moon. Now, in the year of 2012, an athletic boy named Tohma is about to be involved in this centuries-long mystery.

Princess Tutu follows Duck, a duck who was transformed into a young girl and takes ballet at a private school. She becomes enamoured of her mysterious schoolmate Mytho, and transforms into Princess Tutu to restore his shattered heart. Mytho's girlfriend Rue transforms into Princess Kraehe to frustrate Tutu's efforts, and Mytho's protective friend Fakir discourages Mytho's burgeoning emotions. When it becomes apparent that Duck, Rue, Mytho, and Fakir are meant to play out the characters in a story by a long-dead writer named Drosselmeyer, they resist their assigned fates and fight to keep the story from becoming a tragedy.

Louie, a brawny student at the mage's guild, is reluctantly accepted by three girls (Merrill-thief, Genie-fighter, and Melissa-priestess) as a companion for their adventuring party. As the foursome explore ruins, battle dark creatures, and make new friends, they also uncover a sinister plot within the kingdom.