In Paradise Island, Ariel becomes bored with her usual life under the sea and decides to send a message in a bottle — hoping to find some excitement. She receives a reply from someone claiming to live on a colorful, exciting island. Despite warnings from her friend Sebastian (the crab), Ariel is tempted by the promise of adventure. When she sets out to visit her new pen‑pal’s island, she soon discovers that things aren’t as perfect as they seemed — and learns a valuable lesson about caution, trust, and the potential dangers of venturing into the unknown.