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.

"Who says princesses don't wear black? When trouble raises its blue monster head, Princess Magnolia ditches her flouncy dresses and becomes the Princess in Black!" --

Amaya, Princess of House Amethyst in Gemworld, is sent to mundane Earth to teach her that magic is a privilege, but after Amy has long settled into ordinary middle school life, a Prince of the Realm brings her home to restore her magical destiny.

When plans for a ball run a-fowl, Princess Magnolia accepts the help of a valiant new hero to save her secret decorations--and the entire evening!-- Princess Magnolia is at the Flower Festival prepping for the evening ball when suddenly she hears a commotion. Oh no! She isn’t prepared to fight a monster or . . . a grumpy emu! To her surprise, a knight in shining armor comes to the rescue, but not before the princess’s prized decorations are stomped...

Today is Princess Magnolia's birthday party, and she wants everything to be perfect. But just as her guests are arriving... Brring! Brring! The monster alarm! Princess Magnolia runs to the broom closet, ditches her frilly clothes, and becomes the Princess in Black! She rushes to the goat pasture, defeats the monster, and returns to the castle before her guests discover her secret. But every time Princess Magnolia is about to open her presents, the...

Noseholes and elephants! A pet-eating monster interrupts a perfect playdate with Princess Sneezewort . . . but who is that new masked avenger? Princess Magnolia and Princess Sneezewort have plans . . . mysterious plans, like a princess playdate! They dress-up slam! They karaoke jam! They playhouse romp and snack-time stomp! But then a shout from outside Princess Sneezewort's castle interrupts their fun. It's a monster trying to eat someone's kitty!...

The Princess in Black and her friends are enjoying a day of sun and sea on Princess Sneezewort's royal boat when a real, live mermaid princess emerges from the waves! Eeeeeee! Princess Posy needs their help protecting her very cute sea goats from being eaten by a very greedy kraken. But the princesses and the Goat Avenger quickly realize that fighting underwater can be tough for land dwellers, and only the mermaid Princess Posy can save the day. Can...

Miri is eager to return to her beloved Mount Eskel after a year at the capital, but the king and queen ask her to first journey to a distant swamp and start her own miniature princess academy for three royal cousins, but once there she must solve a mystery before she can return home.

The Princess in Black takes a vacation: After battling monsters all night, a sleepy Princess in Black decides that she needs a vacation. After all, the Goat Avenger, a new hero who looks oddly familiar, has offered to protect the goats while she takes a much needed break. The very next day Princess Magnolia rides her bicycle to the seaside, where the air is salty, the sun is shiny, and the sea is as blue as monster fur. But just as Princess Magnolia...