While attending a strict academy for potential princesses with the other girls from her mountain village, fourteen-year-old Miri discovers unexpected talents and connections to her homeland.
Hiding her secret identity as a monster-fighting superhero, Princess Magnolia interrupts her fancy tea with the unsuspecting Duchess Wigtower to stop a big blue monster from endangering her kingdom's goats.
When a mermaid princess needs their help protecting her adorable sea goats from being eaten by a greedy kraken, the Princess in Black and her friends come to her rescue, working together to take down the big blue monster.
Princess Anidori, on her way to marry a prince she has never met, is betrayed by her guards and her lady-in-waiting and must become a goose girl to survive until she can reveal her true identity and reclaim the crown that is rightfully hers.