Daibajin is the ace of the Metropolitan Police Investigation Department. Daimajin (the great demon god) is a twist on that name and what he becomes known as because of his strength. The fiery Daimajin carries a strong sense of justice and quickly arrives at the crime scene before anyone else, but that is because he holds a dark secret… he deals out his own punishment by killing the criminals who never get punished by the law. His secret is discovered by Saimon Hirayasu, a critical and apathetic assistant commissioner. Daimajin is somewhat coerced into becoming Hirayasu’s lackey and gets uncaringly used by him. Daimajin moves to the special order investigation group led by Hirayasu and, under his command, “secretly puts an end to” criminals that the police are really incapable of arresting. But by doing so, Daimajin will step into the dark side of the state and the police organization, which must never be messed with.