Princess Bloom has been hard at work planning her birthday ball in the Magic Garden. When her human friend Cressida arrives to help with the finishing touches, they find a flock of quails destroying all the food and decorations. Bloom is heartbroken! Can Cressida find a way to save the garden ball? One thing is certain - she'll need the magic of all the Unicorn Princesses to do it!Cressida's visits to the Rainbow Realm lead to many exciting adventures with the Unicorn Princesses as she explores their magical world. All it takes is believing!