Goemon's wedding to Murasaki Suminawa, daughter of a samurai clan's leader, is interrupted when the Fuma ninjas attack, kidnapping the bride-to-be and demanding her family's ancient treasure as ransom. Lupin, Jigen, Goemon and Fujiko work together once again to try to save Murasaki and get to the treasure before the Fuma can steal it.
After Nami steals the Going Merry, Roronoa Zoro, Usopp, and later Monkey D. Luffy and Sanji (along with Johnny and Yosaku) set after her and wind up in Cocoyasi Village, Nami's hometown ruled by the tyrannical fishman Arlong. It is here that Nami's past and true motives come to light.
The stickup that started it all! Lupin III and Fujiko are both after an ancient artifact Jigen is supposed to protect, while Goemon happens to be searching for his clan’s lost treasure nearby. Of course, Inspector Zenigata isn’t far behind. This is the story of our heroes’ very first meeting!
The Lupin gang is once again dragged onto a wild treasure hunt! This time, the objective is a mysterious, small dragon statue that even Goemon's steel-rendering blade Zantetsuken cannot cut. The artifact, which once eluded even Lupin the Third's esteemed grandfather, rests deep undersea inside the infamous Titanic, and is the key to unlocking the mystery of Zantetsuken's almighty strength. A wealthy gangster, Lupin, and Goemon all want the statue for themselves!
Luffy, suda yüzen cam bir şişe bulur ve şişenin içinden ise 100,000,000 korsan arasından seçilerek Omatsuri adasına davet edildiğini söyleyen bir yazı ile harita çıkar. Bütün Strawhat tayfası buradaki şüpheli durumu fark etse de, Luffy her zamanki gibi macera fırsatını kaçırmak istemez.Adaya vardıklarında özel hiçbir şey göremedikleri için hayal kırıklığına uğramaya başladıkları sırada önlerine bir eğlence parkı çıkar ve onları karşılayan bir geçit töreni başlar. Bu adada ne tür sırlar ve tehlikeler onları beklemektedir?