Secretly operating his cruiser as a casino at sea isn’t enough for mafia don Lukino Marcano. He’s also looking for the gold-laden boat wreckage worth the budget of a small country! Lupin sniffs out the plan to recover this long-lost treasure and brings along his partners Jigen, Goemon, and Fujiko for the ride to crash Lukino’s party.

Master thief Lupin the Third and his friends have to compete with a greedy banker and her minions to help solve a mystery leading to a treasure that is said to hold history's most powerful rulers.