4화: 유리가 콘서트 관객들을 최면하고, 리나가 루시아와 하논에게 자신의 정체를 밝힌다.

4

A new sea demon, Yuri, appears during a concert given by Taro and uses her music to hypnotize the attendees and attack the mermaid princesses, who are also there. Rina reveals herself to be the mermaid princess of the North Atlantic and then makes acquaintances with Lucia and Hanon. The three mermaids become known as the trio teen idols. (Source: Wikipedia)