My name is Ushio Akaboshi, and I am an instructor at Toshinkai Karate headquarters. His older brother, Sosuke, who was running a karate dojo in Las Vegas, suddenly stopped hearing from him. On my journey to America alone to find my brother, I meet some terrifying people. They are a terrifying martial arts group called "martial arts" that brings together only murder techniques developed in the military. There exists a martial art that surpasses the strongest karate on earth...!? Kazuki Kajiwara and Takeru Nakagusuku draw a new martial arts epic story about the strongest on earth!