Proper Japanese Title: ライアーゲーム (Raiā Gēmu)
Originally serialized in Weekly Young Jump.
Nao, a normal girl recieves a mysterious letter; asking here to attend to the Liar Game. Or rather forcing her to attend the Liar Game.
Two people each receive one million yen. They then have to steal the enemies money, while protecting their own. Through any means necessary. It's a fight of wits and muscles.