Kiichi Miyazawa, heir to the Nadashinkage-ryu school of martial arts, stands on the professional mixed martial arts ring in Japan. He has entered the world of competitive MMA to fulfill a promise born from tragedy: Ryūsei, a close figure from his past who was involved in a plane crash, dreamed of seeing the view from that fighting stage. Kiichi now pursues that vision for himself, stepping into a new chapter of his life as a professional fighter.

The story unfolds across the Japanese MMA circuit, a landscape of sanctioned bouts, weight classes, and ambitious contenders. Kiichi quickly makes an impression with his overwhelming skill, having honed the secret techniques of the Nadashinkage-ryu—a devastating combination of strikes, throws, grappling, and pressure-point attacks. His presence on the ring draws both awe and resentment, particularly from seasoned fighters who have clawed their way up through years of struggle.

Early narrative arcs introduce the gritty realities of professional fighting. Kiichi faces opponents like Kōji Utsumi, a fighter who pushes himself through extreme weight-cutting methods to secure his slot, each match revealing the physical and psychological demands of the sport. The series emphasizes a return to grounded martial arts realism after the more fantastical elements of previous installments, focusing on technical details, training regimens, and the human drama behind each bout. As Kiichi advances, his motivations deepen—beyond honoring Ryūsei, he seeks to carve his own legacy in a world where strength and will are tested every time the bell rings.