Liar Game (2007 - 2010)

"Liar Game" is a Japanese drama about a dangerous game that an honest and trusting girl gets involved in. Nao Kanzaki's life is turned upside down when she comes across a mysterious black box containing a massive sum of 100 million yen. Unknowingly, she becomes a participant in a risky game of liars: by any means necessary, she must take money from her opponents. The loser must return the initial sum, but from their own pocket. Nao realizes that she can't succeed without cunning and deception, especially on her own, so she seeks help from an experienced con artist.