"Lupin III vs. Cat's Eye" is a crossover anime special that brings together two iconic franchises: the master thief Lupin III and the art-thieving trio of the Cat's Eye series. The story centers on a high-stakes rivalry between Lupin and the Kisugi sisters—Rui, Hitomi, and Ai—who operate as the Cat's Eye team. Both groups are after a legendary treasure known as the "Clavis," a key that unlocks a vault containing priceless artworks stolen during World War II. The Clavis is said to be hidden within a painting, and its location is shrouded in mystery.

The narrative unfolds as Lupin and his crew—Jigen, Goemon, and Fujiko—cross paths with the Kisugi sisters, who are determined to recover the Clavis to restore their father's stolen works. The rivalry intensifies as both sides employ their signature skills: Lupin's cunning and audacious heist tactics, and the Cat's Eye team's precision and resourcefulness. The story is driven by a series of elaborate heists, double-crosses, and narrow escapes, with each group attempting to outwit the other while evading the persistent Inspector Zenigata, who is hot on Lupin's trail.

As the hunt for the Clavis progresses, the characters' motivations and backstories are revealed. The Kisugi sisters' mission is deeply personal, tied to their father's legacy as an artist whose works were looted during the war. Lupin, on the other hand, is driven by his love for adventure and the thrill of the chase, though his interactions with the sisters hint at a deeper respect for their cause. The dynamic between the two groups oscillates between rivalry and reluctant cooperation, particularly as external threats emerge, including a shadowy organization with its own agenda for the Clavis.

The climax of the story involves a dramatic confrontation as the true nature of the Clavis is unveiled, leading to a high-stakes showdown that tests the limits of both Lupin and the Cat's Eye team. The resolution ties together the themes of legacy, justice, and the enduring allure of art, while leaving room for the possibility of future encounters between the two iconic groups. The special blends action, humor, and intrigue, staying true to the spirit of both franchises while delivering a fresh and engaging narrative.