Captain Puffy lives a calm yet chaotic life, captaining her crew on the high seas. Until one day she meets a shapeshifting mermaid named Nikki while docked at a nation called L'manberg. She and her crew stay in the town for three weeks. Puffy takes every spare moment and spends that time with Nikki, creating a strong friendship. Nikki eventually decides to join Puffy's crew, their friendship growing stronger and stronger, but will that friendship blossom into something more?