It’s Angel’s birthday and she can’t wait to celebrate with her purrmaid and mermicorn best friends! But the girls don’t seem very excited to celebrate with her. They keep sneaking off to be alone. Angry and hurt, Angel swims out in the ocean by herself and finds Minnie — a manatee who needs help! Can the girls all work together to save Minnie? Or are Angel’s friends too busy with their secret plans?