The plot of Jigen's story centers on the initial encounter of the gang, highlighting Jigen's position as a contemporary Mafia representative responsible for safeguarding a significant antiquity desired by Lupin and Fujiko. In the meantime, Zenigata, a one-time Japanese law enforcement officer, pursues Fujiko across the United States. Conversely, Goemon endeavors to reveal the missing riches of his forefathers.