Something is wrong in the Enchanted Realm, but Ruby can't figure out what. The stallions have scratches on them. The other unicorns hide under the trees instead of playing. Ruby wonders if the herd's newest member, Lucky, is to blame. Meanwhile, a new girl at school is being a bully. She makes fun of Ruby for believing in unicorns. Can Ruby help bring peace back to the Enchanted Realm? And can she figure out what to do with her own bully? 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.