"Lupin III: The Last Job" is a feature-length anime special that centers on the iconic thief Arsène Lupin III and his team as they embark on a high-stakes heist intertwined with historical intrigue. The narrative begins with Lupin targeting a mysterious artifact known as the "Dark Cleopatra," a legendary treasure said to possess immense power. The artifact is hidden within the heavily fortified Schwarz Palace, a former Nazi stronghold repurposed into a high-security facility. Lupin's plan to steal the artifact is complicated by the involvement of multiple factions, including a shadowy organization seeking to exploit the Dark Cleopatra for their own nefarious purposes.

The story introduces a new character, Claudia, a skilled operative with a personal vendetta against the organization pursuing the artifact. Claudia's motivations and backstory are gradually revealed, adding depth to her alliance with Lupin and his team. The core group—Lupin, Daisuke Jigen, Goemon Ishikawa, Fujiko Mine, and Inspector Zenigata—each play pivotal roles in navigating the heist. Jigen provides his marksmanship expertise, Goemon wields his katana with precision, Fujiko employs her cunning and charm, and Zenigata, as always, relentlessly pursues Lupin while inadvertently aiding his efforts.

The plot unfolds with a series of intricate heists, double-crosses, and narrow escapes, showcasing the team's signature blend of wit, skill, and humor. The Dark Cleopatra's true nature is revealed to be tied to a dangerous weapon capable of catastrophic destruction, raising the stakes as Lupin and his allies race to prevent it from falling into the wrong hands. The narrative explores themes of loyalty, betrayal, and the consequences of wielding power, all while maintaining the series' trademark balance of action and levity.

The climax takes place within the Schwarz Palace, where Lupin and his team face off against the organization's forces in a high-octane showdown. The resolution hinges on Claudia's choices, which ultimately determine the fate of the Dark Cleopatra and the legacy of the heist. The special concludes with Lupin and his team narrowly escaping, leaving the artifact's future ambiguous and setting the stage for their next adventure.