A dead rival's final score becomes Lupin's impossible week. He has to return five stolen treasures to five different countries in seven days, which means the heist isn't about stealing anymore, it's about undoing someone else's legacy while staying one step ahead of everyone trying to stop him. The whole special is Lupin proving he's the only thief good enough to clean up after another thief's mess. It's a love letter to the franchise wrapped inside a ticking clock. By the time you realize what Mark actually wanted, the game has already changed shape.

Master thief Lupin the 3rd receives an unusual inheritance: a challenge from Mark Williams, a rival criminal now deceased. Mark's final message is simple but demanding. Five treasures he stole in his prime must be returned to where they came from within one week, or Lupin loses his lead on the legendary Trick Diamond tied to Spain's Sagrada Familia. Fujiko, who worked as Mark's assistant, is hiding secrets of her own. Meanwhile, mafia boss Ivan Crockovich wants the diamond for himself and aims to wipe out the Lupin Gang, while Zenigata stays on their trail. The result is a comedic adventure special built around a race against the deadline.