Bus Gamer, the manga, is a tale about Toki Mishiba, Nobuto Nakajo, and Kazuo Saitou - three individuals invited to participate in the Biz Game. This high-stakes version of capture the flag involves large sums of money and confidential corporate intelligence. Initially, the trio considers it a chance to earn some quick cash. But as they proceed through the levels, they learn about the untimely deaths of those they've defeated. As they witness the murder of a vanquished gamer, they realize that their own lives are in danger. To survive, they must win the game no matter what.