Set in the violent underworld of Yokohama, this manga dramatizes the real-life story of Takahiro Kuroishi, known as the Mad Dog of Yokohama. Once a member of the notorious gang THE OUTSIDER, then a fighter for the organization BREAKING DOWN, and later a successful actor, Kuroishi’s turbulent journey is adapted into a biographical action drama. The narrative follows his rise from a reckless youth drawn to the biker gang Yokohama Renmei to his entry into the criminal group Asia Boss, where he becomes entranced by the charismatic leader Guen. Over time, he faces brutal confrontations with rival factions, including the Brazilian brothers Rikson and Jackson, who form the vicious gang White Maria. No matter how many times he is beaten down, Kuroishi—often called Kuro—keeps rising, his relentless will shaping his path through gang violence and into the fighting ring. The story tracks his transformation from street brawler to a public figure, highlighting the charisma and raw masculinity that define his life. The manga, illustrated by Takeo Ono with supervision by Kenichirō Iwahashi, remains ongoing, with arcs that delve into his past loyalties, his code of honor, and the forging of a legend on the streets of Yokohama.