One Piece. Big Score. Book 6. Sakura Hirurka

On their way to Alabasta, Luffy's crew is forced to make an unscheduled stop at Drum Island due to the severe illness of Nami, who has suddenly collapsed.
Here, in the snowy land, the pirate gang will learn the sad story of the blue-nosed reindeer Tony-Tony Chopper and his mentor Dr. Hirurka, who once dreamed of saving his native kingdom from the oppression of the vile ruler Wapol and healing the soul of his people.
Will Luffy and Chopper be able to finish what Hirurka started? After all, Wapol is not as simple as he seems. And to defeat his enemies, the vile king is ready for any treachery…