When Nami collapses with a raging fever and no medicine works, the Straw Hats steer for Drum Island, a snowbound kingdom said to hold the world's finest doctors. There they find Tony Tony Chopper, a reindeer who ate a Devil Fruit and trained under the eccentric Dr. Kureha, while the deposed king Wapol moves to take the island back. This ninth One Piece film retells the Drum Island arc as a standalone story, adding the original villain Musshuru.