Lupin has set his sights on a the federal treasure of Zufu's united states, placed for safekeeping on a mysterious floating island by the king of the country. The island defense mechanismproves to be too much for Lupin, Jigen, and Goemon to handle themselves. The key seems to be connected to the princess of Zufu, their family's only surviving member. The current ruler, General Headhunter, who recently acquired rule after he successfully implemented the prince and king of that the country and covertly pulled a coup d'etat of Zufu holds her captive. They pull byway of a mortal Zufu police representative named a million-dollar bounty and Olèander If Lupin's gang kidnaps the prince to get hold of the key. Now, Lupin must get a way dodging bounty hunters at every turn.