Rainbow Bubblegem 2: Secret

Rainbow Bubblegem 2: Secret is an anime that follows Princess Purple as she returns to the human world to attend school, driven by a new ambition to become queen. However, her fresh start is jeopardized when a powerful threat resurfaces.

After losing her magical tools protecting a friend, Purple receives new artifacts from the sea's guardian. This empowers her to reignite the magic of her fellow mermaid princesses, yet she struggles to unlock her own unique power. The central conflict revolves around Purple and her allies—both mermaid and human—facing a more dangerous incarnation of the villainous Black Dia. The anime explores themes of self-discovery, responsibility, and the strength found in friendship as Purple fights to protect two worlds without the full strength she believes she needs.