When three complete strangers, Mishiba Toki, Nakajyo Nobuto and Saitoh Kazuo, are hired by a corporation to compete in the Bus Game, an illegal dog-fight conducted in strict secrecy, they are given the team code of "Team AAA" (Triple Anonymous). This group of three who differ entirely from their living environments to their personalities have to work together effectively, but without mutually wiping out their mistrust of each other or prying into each other's privacy. They only have one point in common - each of them need a large amount of money for their individual circumstances. To get the money, they must play in the game despite their very own lives being at stake. 
(Source: Anime News Network)

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Played Hisoka in the Hunter x Hunter musicals.

"When Toki, Nobuto and Kazuo are hired to play the "Biz" game, company secrets and insane amounts of money collide in a frenzied competition that starts out as an innovative way to win cash. But as the game goes on, the players are ushered into a world filled with mystery ... deceit ... and murder. Suddenly they realize what is truly at stake-- their very lives!" (Source: Tokyopop)

Toki Mishiba, Nobuto Nakajyo, and Kazuo Saitoh are hired to play the Biz Game, a game much like capture the flag, only with company secrets and insane amounts of money involved. At first they think it's a crazy but fun way to get some money, but as the game goes on, they hear stories about mysterious deaths on the news, and recognize the victims as members of the teams they've beaten in the game. When one of the losers of a game dies right in front of them, they realize what is really at stake - their very lives! 
This is a re-write of the original Bus Gamer manga

Kazuo Saitou