With all Face Cards cleared, a final message appears: A massive, shimmering gateway opens in the sky. The remaining players—a handful of broken, bleeding souls—stumble toward it. On the threshold, they are given a choice: accept permanent residency as new Citizens (to design the next cycle of games) or refuse and face whatever lies beyond.

Their grim recovery is shattered by the arrival of a drone, carrying a single, terrifying message: The game has entered its final phase. All number cards (Two through Ten) have been cleared. What remain are the twelve Face Cards: The Jack, Queen, and King of Spades, Clubs, Diamonds, and Hearts. These are no mere dealers; they are former players who chose to become permanent residents of the Borderland—the "Citizens." Each game is now a boss battle, designed by a master of their suit.

The Jack is a master manipulator named Enji Matsushita. He doesn't hide; he blends in by fostering chaos. He subtly turns the group against each other, using whispers and feigned alliances. The game becomes a brutal lesson in trust. One by one, players are executed. The turning point comes when a quiet, observant woman named Chishiya (Nijirō Murakami)—who has been playing his own long game—deduces the Jack's tell: a minor inconsistency in his story about a "migraine." Using cold logic and psychological pressure, Chishiya orchestrates a unanimous vote, revealing the Jack. Enji dies with a smile, thanking them for the "beautiful game."

The first and most immediate threat is not a game, but a player. The King of Spades is a juggernaut, a one-man army in tactical gear, wielding a heavy machine gun and a terrifying philosophy: only the strong who fight deserve to live. He doesn't have an arena; the entire city is his hunting ground. He stalks the survivors relentlessly, a constant ticking clock that forces everyone to run, hide, and fight for their lives in the open streets. His presence turns every moment into a survival game.

As the Queen of Hearts falls, all remaining games end simultaneously. But the King of Spades, whose "game" was to hunt endlessly, goes berserk. He arrives at the Queen’s garden, mowing down the exhausted survivors. In a desperate, bloody, and spectacularly choreographed final battle, the remaining major characters—Aguni, Niragi, Chishiya, Usagi, and a newly-resolute Arisu—throw everything they have at him. One by one, they are shot down. Aguni sacrifices himself to pin the King’s arm. Chishiya takes a bullet to shield Usagi. Finally, Arisu, using a discarded grenade, blows up the King’s weapon and impales him with a metal pipe.