When the body of Army Capt. Elisabeth Campbell is found on a Georgia military base, two investigators, Warrant Officers Paul Brenner and Sara Sunhill, are ordered to solve her murder. What they uncover is anything but clear-cut. Unseemly details emerge about Campbell's life, leading to allegations of a possible military coverup of her death and the involvement of her father, Lt. Gen. Joseph Campbell.
In Liar game: Final Stage, Players are encouraged to trust each other to win the tournament. However, a mysterious player named X is secretly plotting to sabotage everyone of their chances to win the LGT.
To exact revenge, the Liar Game office is revived. The target is only one person: Shin'ichi Akiyama. Because of new heroine Shinomiya, Shin'ichi, who kept refusing to take part in the game, finds himself in the game. Along with Akiyama, there's 19 other players competing for the prize of two billion yen. Omega, who revived the game, plays the game at the Liar Game office with Alice. Alice sets up the game, chooses the players, and sets the traps.