The singing sisters

Princess Minna is very good at taming unicorns, kissing frogs and fighting dragons. She always saves the day and is helped by lots of her friends. And now Princess Sky-Blue is coming to visit! They're going to have such fun! But when the train arrives, Sky-Blue's eleven sisters have been turned into nightingales by a wicked witch! Princess Minna is going to need all her skills and all her bravery to put this one right.