Luna Divinestone is a high school senior who was chosen to be Pitch's power source, But things become more complicated as the guardians discovered that the Man in the moon gave a spark of his power to Pitch Black in order for him to turn her into a guardian when the time comes. What are Pitch's intentions? What kind of guardian will Luna become? What is her center? If the guardians were made to protect the children, then who will protect the guardians?