In the second part of the story, The story starts two years later after the end of high school iron fist legend, the main protagonist Kiichi Miyazawa “Kiibo”, became the heir of his family's martial art Nadashinkage-ryu after the previous one his father Seiko Miyazawa suffered a crushing defeat at the hands of his evil twin brother and Kiichi's uncle Kiryu. In order to pay for hospital bills Kiichi has turned to fighting in illegal underground matches called dark fights in which almost anything is allowed. Kiichi has become a mainstay in these fights, not only because of his outstanding victories but that he refuses to seriously injure any of his opponents, upholding his father's teachings of never killing anyone.