Manga by Jojo's author Araki, Hirohiko, unrelated to Jojo story.

Set in America during the pioneering era, “Outlaw Man” is pursued by the Pinkerton National Detective AgencyW after he is awarded with a prize. Despite the man escaping without leaving any footprints, the detective agency manages to find a small trace of his escape and persistently chases after him. The man's beloved horse, Cameron, is eventually shot and killed by the detectives, leaving him in a desperate crisis.