Kengan Ashura Season 1

Kazuo Yamashita is an ordinary fifty-six year old man who one day is summoned by the chairman of his company and hired as a gladiator. He learns that these hired gladiators engage in battles called "Kengan Matches: to protect the corporate rights of the businesses they represent. Kazuo Yamashita is assigned to battle a mysterious Kengan fighter named Ohma Tokita. Both men join the "Kengan Zetsumei Tournament" with the hope of winning the spot as chairman of the Kengan Organization.