Nailani, a sprightly 9-year-old, lived on a tropical island with her five brothers. One day, while exploring the lush forests, she discovered a mysterious rollercoaster hidden deep within. Eager to try it out, Nailani hopped on, only to realize she had an extra arm - a surprising result of her underwater adventures.

As the rollercoaster zoomed through the canopy, Nailani's extra arm flailed wildly, causing her to lose control. Just when she thought all was lost, a superhero swooped in and saved the day, despite Nailani's wings that refused to cooperate. From that day on, Nailani's misadventures became the talk of the island, much to the delight of her amused brothers.