She is the mermaid princess of the North Pacific Ocean, guardian of the Pink Pearl. She is unaware of the danger in the marine world and her true mission until her "big sister" Nikora tells her about them. She is characterized by her simplicity and naivety, but with a strong will she soon falls in love with Kaito Dōmoto, the boy she had saved seven years ago. However, Kaito is unaware of this and has a crush on her mermaid form. Her best friends are Hanon and Rina, other mermaid princesses.