Lupin is planning a big heist on a horse race, but Jigen has some business to attend to first. Hired as a mercenary, Jigen goes to protect a man in South Africa. Lupin is approached by a young girl named Michelle, who asks for Lupin's help with her billionaire father- until she is suddenly kidnapped! Meanwhile, Fujiko and Goemon set out on their own to find a huge diamond. However, all these paths are not so unrelated as they might seem, and the story unfolds in the seven days up to the big horse race.