The story revolves around Kiichi Miyazawa, a 17-year-old teenage high school student and his father, Seiko Miyazawa, who is training him in the family's secret martial art, Nadashinkage-ryu, a fighting style that was created around the end of the Meiji Era Japan. The style itself uses punches, kicks, throws, grappling, as well as knowledge of striking pressure points and vital points on the human body. With a passion for martial arts, Kiibo is striving to become strong by testing his skills against various fighters from different areas of Japan, as well as the world, via street fights and tournaments.