A corporation enlists Mishiba Toki, Nakajyo Nobuto, and Saitoh Kazuo, three strangers, to participate in the top-secret Bus Game – a brutal dog-fighting arena. Calling themselves "Triple Anonymous," the trio must conquer their suspicions and honor each other's privacy to succeed, despite their contrasting backgrounds and personalities. Desperate for a substantial amount of cash for their individual reasons, the team has no other choice but to enter the perilous competition and gamble their lives for it.