"Kengan Ashura" is a proxy war between corporations, where business disputes are settled through matches between hired fighters, with massive profits at stake. 56-year-old salaryman Kazuo Yamashita encounters the mysterious fighter Ohma Tokita and gets dragged into the Kengan matches! Overcoming money, life, family, and various entanglements, the two continue to win and deepen their bond. Now, they are set to participate in the "Kengan Annihilation Tournament," which will determine Japan's top corporation and fighter—!?