The Mermaid Queen invites Manatsu and her friends to Grand Ocean as she wants them to find the ocean ring. However, when they return to the castle with no clues on its whereabouts, they realize something is wrong with the queen...
The Mermaid Queen invites Manatsu and her friends to Grand Ocean as she wants them to find the ocean ring. However, when they return to the castle with no clues on its whereabouts, they realize something is wrong with the queen...