Kaji Takaomi was originally a very ordinary man before he met Madarame Baku with a typically trusting personality. But as he went through and experienced many life-threatening situations, his mentality strengthened. He grows and becomes more courageous against dealing with people like yakuza and Kakerou.

Kaji hates the idea of killing his opponent in a gamble.

There are gamblers out there who even bet their lives as ante. But to secure the integrity of these life-threatening gambles, a violent and powerful organization by the name of "Kakerou" referees these games as a neutral party. Follow Baku Madarame a.k.a. Usogui (The Lie Eater) as he gambles against maniacal opponents at games&mdash;such as Escape the Abandoned Building, Old Maid, and Hangman&mdash;to ultimately "out-gamble" and control the neutral organization of Kakerou itself.