Atsushi Kojima is a high school student who endures relentless bullying. Feeling powerless and full of self-loathing, his life takes a turn when he stumbles upon the autobiography of Atsushi Tateshima, a legendary figure in the world of kickboxing. Inspired by the story of the real-life fighter's resilience and indomitable spirit, Kojima decides he must change. Driven by a desperate desire to escape his weak and hated self, he begins to immerse himself in martial arts. The story follows Kojima's journey as he steps into the world of kickboxing, guided by the charisma of the champion who unknowingly set him on this path, and chronicles his physical and mental growth as he trains and fights to transform his life.