Lupin and Jigen had plotted a massive heist at a New York racetrack with flawless precision. All that remained was to bide their time for six days before executing their scheme. Anticipating the success ahead, they decided to revel in celebration at a nearby town. However, Lupin was unexpectedly called away due to a previous engagement, leaving Jigen to his own devices. Whilst wandering solo, Lupin crosses paths with Michelle, a damsel in distress being pursued by shady characters. She implores Lupin to pilfer a diamond from her father, which she believes will deter him from indulging in malicious activities. With a plan to obtain both the diamond and the racetrack fortune in six days, Lupin agrees to protect Michelle for that duration. Meanwhile, Jigen reunites with old comrade Ryatte, and the two discuss another business venture. Before the heist with Lupin, Jigen is designated to spend the next six days with Ryatte. Simultaneously, Fujiko and Goemon are cooking up a plan to snatch a diamond at a forthcoming exhibition. The target of their theft? None other than the host of the show...