About the Drum Island Arc
After Nami falls ill with an unknown disease, the Straw Hat Pirates travel to Drum Island in search of a doctor. The crew meets a bizarre talking reindeer named Tony Tony Chopper, who helps them fend off the country's former despot king Wapol after he returns to reclaim his throne.
Nami catches a deadly fever in Little Garden, forcing the Straw Hat Pirates to make a detour to the kingless island of Drum. On their way to the island, they are attacked by a group of pirates led by Wapol, whose Baku Baku no Mi allows him to eat anything and assimilate it into himself. After a brief skirmish, Luffy sends Wapol flying into the sea and the Straw Hats continue onto Drum Island. When they land, they are attacked again, this time by Drum Island's militia. However, after hearing about their plight, Dalton, the former captain of the guard, calls off the attack and leads them to the town of Bighorn. There, he explains the situation that the island is in.
In the recent past, the island was ruled by a cruel king, Wapol, the pirate the Straw Hats encountered earlier. Wapol banished all but the 20 best doctors from the island. For any medical treatment, one would have to beg him for the help of one of the remaining doctors, his "Isshi-20" as he called them. However, a powerful pirate named Blackbeard attacked the country. After witnessing Blackbeard's power, Wapol and his cabinet, with the exception of Dalton, fled to the sea without even fighting back. Now, there is only one doctor left on the island—Dr. Kureha, who is often called a witch by the townspeople. She comes into towns at her own whim to check for patients. She lives in Drum Castle, which is on top of the highest of the "Drum Rockies", a chain of drum-shaped mountains.
After learning this, Luffy and Sanji head for the mountain with Nami in tow, only to be attacked by dozens of Lapahns, giant ferocious rabbits. A fight ensues, and its ferocity causes an avalanche. Sanji is injured, so Luffy must climb up the mountain while carrying both Nami and Sanji. When he reaches the top, both his hands and feet are severely damaged. He collapses in front of Dr. Kureha and her assistant, Tony Tony Chopper.