Nao Kanzaki is a college student known for her honesty and naivety. One day, she receives a black postcard indicating that she has been selected to participate in the "Liar Game Tournament." Along with the postcard is a box containing 100 million yen. The goal of the first round of the game is to trick the other player out of their hundred million yen. In the end, the winner gets to keep the hundred million earned, while the loser owes the LGT 100 million yen, which "will be collected by any means and at all costs."