Since the Edo period of Japan, gladiator arenas have existed in various forms around the world. In these arenas, wealthy business owners and merchants hire gladiators to fight in unarmed combat where the winner takes all, called Kengan matches. Yamashita Kazuo, an average Japanese salaryman for Nogi Group witnesses a street fight in an alley between two mysterious fighters. One of the fighters, (you) is scouted out by the Nogi Group CEO, Nogi Hideki, due to defeating your previous fighter in the street fight. Kazuo is roped into managing you who joins these arenas only to devastate his opponents. Your spectacular ability to crush your enemies catches the attention of big business owners, leading to your inclusion in the Kengan Annihilation Tournament under the invitation of Hideki. This tournament is held by the biggest CEOs in Japan and the winner gets the seat of Kengan Association chairman, a position which holds immense power and prestige.

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