Since Japan’s Edo period, powerful business deals have been settled not in boardrooms but through Kengan matches — brutal gladiator-style duels fought by representatives known as gladiators.

The story follows Tokita Ohma, a mysterious and extremely skilled fighter recruited by the Nogi Group to represent them in these deadly battles. His goal: to rise through the ranks of the Kengan Association and prove his unmatched strength, all while uncovering the dark secrets behind his past.