The timid old man Yamashita Kazuo has found himself caught up in a ring of marital arts matches where corporations wager massive profits on martial arts fights between hired fighters. They are called the Kengan Matches!! Kazuo is given a mission to manage their company's fighter: a young man who is violence embodied named Tokita Ohma. What will grow between them across the age gap? Friendship? Submission? Or something else...?? It's a passionate drama where a 56-year-old can still grow... The fierce fights between hardened gladiators is about to begin!!

Public combat sports vs. underground martial arts... Who will win the final match of Round 1? There are two matches left in the first round of the tournament!! Kaolan Wongsawat, the heavyweight boxing champion, clashes with Kaneda Suekichi, the man who fought for his place in the tournament! Then, the "King of Combat," MMA champion Okubo Naoya, faces off against "The Fang of Metsudo" Kanoh Agito, who has reigned as emperor over the Kengan Association. A fight for the "strongest," fitting for the last match of Round One, begins!!

Business meets violence. The ultimate fighting manga begins! Yamashita Kazuo is a 56-year-old man with a broken home stuck in a dead-end job, but suddenly he gets called in by the president of his company! The timid Yamashita Kazuo learns the truth about the Japanese economy: that corporations are wagering massive profits on martial arts fights between hired fighters. They are called the Kengan Matches!!!! Kazuo is given a mission to manage their company's fighter: a young man who is violence embodied named Tokita Ohma!!! What lies in store for Yamashita Kazuo...!!?? Violence meets business meets human drama. Why do men fight? What do they grasp with their fists? The ultimate martial entertainment begins here!!!!

"All you need is the floor and your body. Then all that's left is to make a fist."...Shinya Kinoshita, a boy with incredible posture, and Takumi Yanagiya, the 6-time elementary school national champion. They met by chance... but it was surely fate. The two meet, laugh, and are drawn together by each other. The stage of this story is the Kawasaki Ukishima Junior High School Karate Club. A karate journey full of sweat, bonds, and smiles is just beginning!!

The first round of the Annihilation Tournament begins!!! A martial arts tournament to decide the strongest corporation and fighter in Japan has begun!!! 32 fighters and 32 corporations clash with their pride and interests on the line... Which one will win...!!?? The tournament bracket is announced... And the unmissable first round is finally underway!!!

A blood-boiling modern martial arts comic! The Kengan Annihilation Tournament, a scramble for the chairmanship, has been announced, and all corporations and fighters are on the move...!!! A mysterious man named Kiryu Setsuna appears before Tokita Ohma. Fighters seek to win, and CEOs seek the chairmanship. Yamashita Kazuo has been saddled with debt to become a Kengan Association member, and Tokita Ohma has entered the tournament as Kazuo's affiliated fighter. What lies in store for them!!!!!? The day of the tournament has come at last!!!

The duels have begun. The Kengan Annihilation Tournament is underway! The blood-boiling modern martial arts comic has reached volume 3!! The Kengan Matches are an ancient Japanese tradition where corporations wager massive profits on martial arts fights between hired fighters. The Nogi group's hired fighter Ohma, and his manager Kazuo, have entered their third match against Sekibayashi Jun, a pro wrestler who's fought 57 matches without losing once!! What will Kazuo see in this fight against a foe like never seen before!!?? And finally, the Kengan Annihilation Tournament is announced, where the strongest fighter and corporation will be crowned!!