Arisu and Usagi try to unravel the mysteries of Borderland to return to the real world. In a place they believe holds the key to uncovering these mysteries, they meet allies, enemies, and the mastermind behind all of the games. Arisu and the others pit themselves against games of a scale and difficulty that exceed the first season. The remaining games are only the Jack, Queen, and King cards, but will they be able to collect them all and return to the real world?

With his two friends, a video-game-obsessed young man finds himself in a strange version of Tokyo where they must compete in dangerous games to survive.