Death God Fist (死神拳, Shingami-Ken), also known as the Hero Monster (豪快怪獣, Goukai Kaiju) is the only mysterious person known to be allied on the side of justice. He was created involuntarily by Demon God Fist, awoke the "grip of murder" within him, a dark power which is said to lurk in the hearts of all martial artists. He temporarily lost his sanity to bloodlust, anger and rage, though thanks to the influence of his leader ultima, he was relatively reformed and stabilized, so much so that the hero association now use him as a member of the secret elite squadron. His goal is to seek down and take revenge on demon god fist, his destined rival for stealing his humanity.