During the turbulent postwar period, a baby was born to a strangled pregnant woman whose family was attacked by a group of robbers.
The only surviving boy has a tragic fate and is raised as an orphan, abused, and raised like a wild dog. Due to the boy's violent temper, he is nicknamed ``Fang Naoto'' (his real name is Naoto Yamamoto).
One day, a man appeared in front of Naoto, who eventually became a yakuza bodyguard. It was Tetsugen Daito, a master of fighting karate known as God Hand. Naoto's encounter with karate changes him greatly.
A masterpiece of karate manga, also known as the youth manga version of Karate Baka Ichidai, created by Ikki Kajiwara, a giant in the world of graphic art. This is the part of the trilogy that depicts a group of strong men, based on the upbringing of the main character, Naoto