Doubutsu Takarajima

On a small island, Jim, an innkeeper, lives with his friend Gran, a mouse. Their peaceful life is disrupted when a mysterious man arrives, leaving behind a map that supposedly leads to a treasure on a distant island. Intrigued, Jim and Gran decide to set sail, abandoning their innkeeper duties, and are soon joined by a new friend, Kathy. However, they're not the only ones after the treasure, as they encounter Captain Silver and his crew of wild pirates, who will stop at nothing to claim the loot for themselves. As Jim, Gran, and Kathy navigate the high seas, they must outwit the pirates and overcome the challenges of their quest to reach the treasure before it's claimed by others.