When Nami falls gravely ill, the Straw Hat pirates embark on a mission to Drum Island to find a doctor. However, they discover that the only remaining physician is the secluded Dr. Kureha, residing atop a treacherous mountain. With Nami's life hanging in the balance, Monkey D. Luffy and Sanji brave the hardships of the journey towards the reclusive doctor. Meanwhile, the resurgence of Wapol, the island's former tyrannical king, alongside his brother, threatens turmoil for the inhabitants. As Wapol aims to reclaim his oppressive rule and the scarcity of medical aid, the Straw Hat Crew, aided by the quirky reindeer Chopper Tony Tony, must navigate challenges to save Nami and prevent Drum Island from descending once more into dictatorship.