Rainbow Bubblegem 2: Secret

With the Bubble Gems scattered and peace restored, Princess Purple cannot ignore her fascination with the human world. She wants to attend school on land, and when her father objects, she answers with an even bigger declaration: someday she will prove herself worthy of becoming queen. Her plans quickly become complicated when she loses her magical tools while protecting Leo, then receives new ones that let her create upgraded gems for the other princesses. The one color she cannot complete is her own. At the same time, Black Dia returns with greater power than before. Between school, friendship, and responsibility to the sea, the seven mermaid princesses must reunite before Purple's unanswered mystery becomes exactly the weakness their enemy needs.