At the beginning of the anime, when Chacha is about to begin school, Seravy gave her a pendant called the Princess Medallion, and a magical bracelet and ring to Riiya and Shiine respectively. The Princess Medallion enables Chacha to transform into the Magical Princess, who can defeat Daimaō’s minions, when she shouts the phrase “Let Love, Courage and Hope — Magical Princess Holy Up!”. However, the transformation works only if the three of them get together.
In season one, Chacha, Shiine, and Riiya attend Urara School, named after their principal Urara. The three are in Banana Class with their teacher named Rascal-sensei who wields a whip and looks strict, but is actually very kind. On the same class is Kurozukin (“black-hooded”) Yakko and Orin. Yakko admires Seravy deeply and even calls him Seravy-sama. Orin is a ninja of the Momonga Clan, and good at concealing herself. Orin is probably the most truthful character in the story, she develops a crush on Shiine when they first met. Later a selfish mermaid called Marine tags along because she is interested in Riiya.
In the second season, after Chacha’s weapon, the Beauty Serene Arrow, was unable to beat one of Daimaō’s minions, Access, the trio began to search for another, more powerful weapon called the Phoenix Sword or Wing Kris. As they do so, Chacha discovers that her parents are the King and Queen of their land. After encountering many obstacles, they find Phoenix Sword. They then begin their quest for the Bird Shield, the third weapon that the Magical Princess must acquire to defeat Daimaō’s minions. At the end of this story arc, Chacha, Shiine, Riiya, Orin, Yakko, Marine, Dorothy, and Seravy together, as the eight Holy Warriors of Love, Courage, and Hope, get inside Daimaō’s castle. They defeat Daimaō, after which the castle and the kingdom changes back to its original shape and color.
In season three, the King’s Crest, which is a magical artifact called the Holy Bird, is stolen by one of Daimaō’s minions, Soprano. Whoever possesses the King’s Crest can make the world good or evil. When Chacha as the Magical Princess fights Soprano, by accident they break the seal, allowing demons to enter their world and start devastating their land. Seravy tells them that to close the seal again, they must use things that are from gods or goddess. Because the Pendant, Bracelet, and Ring were given to them by Queen Joan, now a goddess, they sacrifice the three items to save the world. As a result, Chacha can no longer change into the Magical Princess, but her family gives her three more magical items, a magical brooch, compact, and Crescent Aurora Bracelet, which she can use to call up a boomerang which in turn brings her the items that can solve her problems. The rest of the series are based on the first 5 volumes of the manga. At the end of the series, Seravy settles down, engaged to be married to his former classmate, Dorothy.