Lupin and Jigen devise a meticulous scheme to snatch a vast fortune from a New York racetrack, with only a six-day countdown left. Taking a break in a nearby town, Lupin departs briefly due to a prior commitment, leading to a chance encounter where he rescues Michelle, a girl pursued by shady figures. She implores Lupin to pilfer a precious gem from her own father to thwart his sinister intentions. With the promise of both money and the diamond on the horizon, Lupin agrees to safeguard Michelle for the impending six days. Meanwhile, Jigen reunites with Ryatte, an old comrade, and becomes entangled in a different venture during the same time frame. Concurrently, Fujiko and Goemon craft a plan to swipe a diamond from an upcoming exhibition, setting the stage for a series of entwined destinies.