Queen Ercell, in addition to being queen, is also the principal of the Princess Academy, and the keeper of the Eternal Tiara. She is in charge of finding the Platinum Princess candidates and guiding them through their tasks. 

Seventeen-year-old Yucie can never be taken seriously. How can she, when she's been cursed to be trapped in a ten-year-old's body? Bright, cheerful and optimistic, Yucie has never let her curse get in the way of living a happy life. Her life is about to change forever when she becomes a candidate to become the Platina Princess, an honor which will allow her ultimate wish to be granted! Then she finds out that she is one of many candidates, and the competition is intense! 
 
(Source: ADV Films)

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Mother of voice actress [Honoka Inoue](https://anilist.co/staff/129363/Honoka-Inoue). She has held a long-running gag of being 'eternally 17 years old'.

There is a legend that the gods granted the hero a task, which is to raise a little girl into something extraordinary. In this story, this young girl is Yushi, a 17-year-old girl that has been put under a spell: her body stopped aging ever since she was ten years old. She has been selected as a candidate to become the next Puchi Puri Princess. The girl selected to be princess will receive a magical tiara which grants the wearer anything she wants. This means that if Yuushi becomes princess she can wish her spell away! However, the competition is stiff and Yuushi still looks like a 10-year-old girl. 
Note: This manga details the beginning journey of Yushi becoming a candidate and attending an academy where she will be trained the modesty of being a potential Puchi Puri Princess. The story is to be continued in the anime version of this title.

Ercell Joou