Sent by Opaline, Misty Brightdawn must infiltrate Maretime Palace for her next mission. If she succeeds, she'll be granted her life's purpose, a cutie mark. But as Misty closes on her goal, priorities change. After entering Maretime Palace as a bodyguard for Princess Sunny Starscout, Misty starts to enjoy a certain part of the job more than she thought she might. Will Misty follow through with her mission, or heed a new call?