It was sunny and calm, and the members of the Straw Hat Sea Thieves were enjoying a good time, while Nami suddenly had a high fever and could not afford to fall ill. In order to cure her illness, everyone sailed to the magnetic drum kingdom, a big medical country known as the "everwinter island". Under the guidance of the local people, Lu Fei and others carried Nami up the mountain to find the only witch doctor on the island-Dr. Wu Yu. At the same time, Wapolu, who fled the country because of the war a year ago, made a comeback with his evil wizard brother Muxiuru, who tried to expel Wu Yu and regain his rule over the land. All of a sudden, the war reignited, and the straw hat and sea thieves who lingered here were forced to be involved. Based on the original work of the same name by Japanese cartoonist Junichiro Oda, this film is the ninth animated theater version released in 2008, and it is also a work commemorating the 10th anniversary of the cartoon series.