"Jūgo Shōnen Hyōryūki Kaizokujima DE! Daibōken" is an adventure anime centered around a group of fifteen boys who find themselves stranded on a mysterious island after their ship is caught in a storm. The boys, ranging in age and background, must band together to survive the challenges of the island, which is revealed to be a haven for pirates and filled with hidden dangers. The narrative explores their struggle to adapt to the harsh environment, uncover the island's secrets, and ultimately find a way to escape.

The island itself is a central element of the story, featuring treacherous terrain, wild animals, and remnants of pirate activity, including hidden treasures and traps. As the boys explore, they encounter various obstacles that test their resourcefulness, teamwork, and courage. The group dynamics play a significant role, with conflicts and alliances forming as they navigate their predicament. Each boy brings unique skills and perspectives, contributing to their collective survival efforts.

The pirates who inhabit the island add a layer of tension and intrigue. Initially portrayed as antagonists, their motivations and histories are gradually revealed, complicating the boys' understanding of their situation. The pirates' presence forces the boys to confront moral dilemmas and make difficult decisions, blurring the lines between right and wrong. The narrative also delves into themes of friendship, resilience, and the struggle for freedom, as the boys grapple with their desire to return home while facing the allure of the island's mysteries.

The story progresses through a series of episodic adventures, each highlighting different characters and challenges. These episodes build toward a larger narrative arc, culminating in a climactic confrontation with the pirates and a resolution that ties together the boys' journey. The anime balances action, suspense, and character development, creating a compelling tale of survival and self-discovery.