A Japanese manga series originally written and illustrated by Shinobu Kaitani. The manga was first serialised in 2005 in the Japanese manga magazine Weekly Young Jump, published by Shueisha. It was adapted into a TV series, which started airing on April 14, 2007 on Fuji TV, achieving a 11.4 viewership rating in Japan's Kantō region. A sequel, Liar Game 2, ran from 2009 to 2010. It was also adapted into two live action films: Liar Game: The Final Stage in 2010, and Liar Game: Reborn in 2012.

At the start of the manga, a scrupulously honest college student named Nao Kanzaki - receives a package containing 100 million yen (about 1 million dollars) and a note that she is now a contestant in the Liar Game Tournament. In this fictional tournament, contestants are encouraged to cheat and lie to obtain other contestants' money; those who lose have to bear a 100-million-yen debt. When Nao's first opponent - a trusted former teacher - steals her money, she seeks assistance from a con man named Shin'ichi Akiyama. Though they manage to defeat him, Nao and Akiyama decide to buy out his debt and advance through different rounds of the Liar Game Tournament against merciless contestants, while at the same time attempting to free their opponents from debt and to defeat the Liar Game organisation from within.

In the First Round, each player was given 100 Million Yen (roughly 1 million dollars) and an opponent. They were given thirty days to steal as much money as they can from their opponents. Without their knowledge, the LGT Office had changed the participants' phone books so they would be unable to call for help, and had made tremendous efforts to prevent the participants from going to the police. After the round, participants who won proceeded to Round 2, and those who lost were forced to pay back all the money they were given. Any profit obtained by the winner could be kept, but those wishing to drop out were forced to repay half of their winnings.

Result: Kanzaki Nao wins but gives Fujisawa Kazuo (loser) ¥50,000,000, only because Akiyama demanded the other half for his services.

In this round, participants played a game called Minority Rule, in which random players are selected to ask a question and then all players must answer either yes or no. The side (Yes/No) with the most players voting for them are eliminated. Winner takes all the money awarded (100 Mil. Yen per person), and can pay half of it to drop out. Otherwise, he proceeds to Round 3. Losers can proceed to the Revival Round, and are expected to pay back their debts.

Result: Akiyama was declared the winner, beating Fukunaga, Miura and No. 15 in the final round. Akiyama progressed to Round 3 while many of the others entered into the Revival Round.

The Revival Round consists of an eight-section game in which players are given 5 votes per round and 100 million yen. The person with least amount of votes after all rounds has his winnings divided evenly amongst all the other players, and has to pay back his increased debt. All other players proceed to Round 3 in debt.

Result: Nao wins (has the most votes) and all players advance to Round 3, but Miura Takayoshi is eliminated. Nao uses her winnings to erase Miura's debt.

This round consists of a game divided into two teams, the North Country and the South Country. At the beginning of each round, one player from each team is the smuggler, and the other is the inspector. The smuggler goes to an ATM machine in a separate room and puts money into a briefcase. The inspector must guess how much the smuggler has in the briefcase. If the inspector passes the briefcase, the smuggler keeps however much there is inside. Several scenarios result if the inspector chooses to guess the amount inside the briefcase: if the inspector incorrectly suggests an amount and there is no money, then the smuggler receives half the amount guessed by the inspector; if inspector underguesses the amount, then the smuggler keeps all the money in the briefcase; in all other circumstances, the inspector takes the money from the smuggler if the quantity inside is less than the inspector's estimate.

Result: The Northern Country wins and progresses to the Round 4 Qualifier while the Southern Country may enter the Second Revival Round to try to re-enter the tournament.

In the second revival round, six contestants are split into two groups of three and set against one another. There are three rounds, each based on a different gambling game, and the team that wins at least two out of three rounds will advance to the next round. The losers are permanently removed from the Liar Game and made to pay back all of their debts.

Result: Eastern Army (Kanzaki Nao, Akiyama Shinichi and Fukunaga Yuji) wins overwhelmingly and advance to Fourth Round Qualifier. They use the winnings from the revival round to pay back the debts of the Western Army.

The Round 4 Qualifier takes place to narrow down the large number of players who have proceeded to Round 4. The groups are split into two large groups and made to play a game where the objective is to create vaccines by contacting with other "normal" players. Two players are made "infected" and must contact with other "normal" players to return to normal, at the cost of infecting the other player. Players with 4 or more vaccines can advance into Round 4.

Result: Group A wins: 6-loses: 6, All Group B players wins.

This round is a game of musical chairs, though it is slightly altered. Players must get to a seat before they are all taken, with any player left without a seat being eliminated. The players are given 23 medals, each of which are worth ¥100,000,000 for a total of ¥2,300,000,000, of which only those bearing the winner's name can be cashed in for prize money. All players eliminated in the qualifier serve as "extras" along with the others eliminated throughout the round. In each sub-round, a chair is removed by a person voted by the majority.

Result: In a sense, Akiyama group's complete victory.

There are two separate games of Bid Poker in this round. Group A is located in an internet cafe, while Group B is in a dance hall, players are given tablets with which to bid on card lots. On the tablets are 300 coins, in which one coin equals 1,000,000 yen. At the end of the game, players must pay back 100,000,000 yen.