Ultimate Vigilantes......

Koichi Haimawari having lost his chance to become a hero, he begins to "work" as a vigilante, doing good deeds for the public, which earned him the appreciation of the citizens, who start to refer to him as "Nice Guy" or "Gentlemen" in response.
During one of his patrols, Koichi helped an unknown pedestrian who had had a fight with another person. Koichi could barely see the face of the man, who left the place without saying anything to him. While not knowing it, Koichi had just helped the person who would one day be his master Knuckleduster, who would be forever grateful for his kindness and good heart.

A/n:"This is a Prequel of My Guardian Angel Fallen From Space"