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He has his sights set on the national treasure of the country of Zufu, which has been hidden on a mysterious floating island since the country's late king deposited it there for safekeeping. It turns out that the island's super-intelligent defense mechanism is far too much for Lupin, Jigen, and Goemon to handle on their own. The princess of Zufu, the last surviving member of the royal dynasty, appears to be tied to the key in some way. Currently, she is being held prisoner by Zufu's current ruler, General Headhunter, who just ascended to the throne of the country after secretly staging a coup d'etat and ordering the execution of the kingdom's king and prince. When Lupin's group kidnaps the princess in order to obtain the key, they find themselves in hot water with a vicious Zufu police agent named Olèander and a million-dollar bounty set on Lupin's head by the deranged Headhunter, who is on the run from the authorities. Lupin must now find a safe route to the treasure, escaping bounty hunters at every turn along his journey.