Yucie is a girl who fell down from the heavens like a shooting star... when she turned 10, she stopped aging...
Yucie's friend from the demon world told her about the wish-granting tiara given to the prince's bride... When the 5 worlds combine together, the Eternal Tiara will grant any wish that is made. The Platinum Princess is the one who recieves the tiara, she must possess a heart worthy of it... Yucie wants to wish to become an adult.
Yucie noticed a shining light at the top of the castle, and was drawn toward it... she used her flying magic to sneak in and got into the room with the Eternal Tiara. The queen comes and tells her she must not touch it, anyone who touches the tiara unqualified will die... she praises her for getting this far, and acknowledges her as a candidate for Platinum Princess.
She starts attending a Princess candidate academy.. everyone there is referred to as a "Petit Princess"
First of all, she's not wearing matching clothes, so she wishes on her pendant to change to the school uniform...
"To wish strongly for something is a vital power of the heart."
Yucie gets the Crystal Flower... the first of the 5 elements needed to become worthy of the tiara. Her rival is the Princess of the Demon World, she is also trying to become the Platinum Princess, but she always tries to cheat.