The movie begins at the wedding of Goemon Ishikawa XIII and his fiancée Murasaki. During the ceremony where the Suminawa family heirloom, a valuable antique urn, is handed over to Goemon, several black-clad ninja attack the party and attempt to steal the urn. Lupin and his colleagues fight off the ninja, but during the confusion others kidnap Goemon's bride-to-be and escape, leaving a ransom note.
Meanwhile, Inspector Zenigata has retired to a Buddhist temple following the apparent death of his long-time quarry Lupin. A colleague from ICPO is trying to persuade him to return to work, but Zenigata says he has "no interest in a world without Lupin". Zenigata soon changes his mind when he is shown a photograph of Lupin at the wedding ceremony earlier that day. Zenigata resumes his life-long pursuit of Lupin!
At the Suminawa household, Murasaki's grandfather explains to Goemon that the urn holds the secret location of the Suminawa family treasure, and that the Fuma clan, the ninjas who attacked the ceremony that morning, have been trying to steal it for just as long. He refuses to hand over the urn to the Fuma clan, but Lupin steals it instead and exchanges it for Murasaki's life. The urn contains a hidden engraving revealing the location of the treasure; an underground cave deep in the mountains.
Soon the race is on as Lupin and company, with Zenigata in close pursuit, try to beat the Fuma clan in negotiating the trap-laden caves beneath the mountain to find the ancient treasure.
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