When Kiniro, a young mermaid, comes upon a gorgeous house made of seashells and coral, she is so curious that she goes inside. She’s thrilled to find a just-right breakfast, pretty little chair, and, best of all, a comfy bed that rocks in the current. But when the Octopus family returns home, they are not happy to find that someone has been eating their food and breaking their things. Baby has the biggest shock when she finds the mermaid asleep in her bed! Luckily, shock turns to happiness when Kiniro gives her a thoughtful gift before escaping from the twenty-four arms coming her way.