Lupin is on a chase where a treasure has been hidden by a notorious band of thieves who are rampaging through Southeast Asia. But first he has to look for the keys to the treasure. Naturally, Lupin and his cohorts are not alone; Sir Archer, a British royal, and his granddaughter are also hunting for the very same thing. And the two groups are also up against a mad villain, whose main goal is to conquer the world. Unable to go it alone, Lupin and his crew team up with an unlikely partner — Sir Archer — to defeat the conquerors, one of whom turns out to be Sir Archer's own lawyer! Though will Lupin be able to get himself out of this gem of a mess?

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Parent story: Lupin Sansei: Part III