The King goes underground! When Yujiro appears in the underground arena and quickly humbles his champion son, he accepts a vigorous challenge from the patient Doppo. Doppo's secret ten-year vendetta is exposed to the younger generation's champion - as well as his tremendous abilities as a grappler. But Baki must remain focused.

With his burgeoning friendship with Doppo on the line, he can't help agonizing over the possibilities of the elder warrior's bout with Yujiro. However, his own fate is in question as he awaits his match with a unique foe more concerned with nutrition and exercise than fighting. Kureha battles for the chance to prove the merit of years of research and seal his destiny as the supreme being on the planet.