Shōzan Matsuo, founder and head of Japan’s Hokushin School, commands fear as “the Demon of Karate,” wielding combat abilities marked by supernatural speed and devastating power that solidify his position atop the narrative’s martial hierarchy. His reputation eclipses even elite contemporaries like Bunshichi Tanba and Jūzō Fujimaki, as he relentlessly pursues challengers to legitimize his claim as the “Strongest of All.”

To draw out worthy rivals, Matsuo orchestrates an underground martial arts tournament alongside Makoto Tatsumi of the Federation of Amateur Wrestling, promising the victor a direct duel against him. When champion Tsutomu Himekawa collapses from injuries, Matsuo brutally dismantles a yakuza enforcer and a SWAT officer armored in cutting-edge Duralium riot gear, showcasing his unchallenged supremacy.

As Hokushin School’s leader, he dominates the martial arts underworld, recruiting and testing fighters such as Tanba while strategically engineering conflicts like the impending five-on-five showdown against Tatsumi’s faction. This calculated escalation underscores Matsuo’s role as a manipulative force within high-risk combat networks, where his actions continually reinforce both his legend and the lethal hierarchies he governs.