The Cupcake Castle is hosting a baking contest, and Ruby cannot wait to compete. But when a recipe mix-up almost ruins her cookies, she tries adding magical starberries from the Enchanted Forest to save them. Much to Ruby's surprise, she makes it to the next round of the contest. After some more baking, she discovers that starberries can make anything taste good. The title of Junior Baking Champion is within her reach . . . if she cheats. Can Ruby win without the use of magic? There are unicorns behind Magic Moon Stable, but no one knows they exist except Iris and Ruby. As Unicorn Guardians, the two girls must protect the unicorns to keep them safe from the outside world.