Doryoku Shisugita Sekai Saikyou no Butouka wa, Mahou Sekai wo Yoyuu de Ikinuku.

In his previous life, he was a martial artist who dedicated every breath to perfecting his craft—until death claimed him and cast his soul into a world where magic reigned supreme. Reborn as Ash, he opened his eyes to a society woven from spell and incantation, only to discover that his new body lacked even the faintest spark of magical talent. To a family that valued arcane power above all else, a magicless child was worthless; at just five years old, Ash was abandoned to the merciless depths of the forest, left to perish alone. Salvation came in the form of a grizzled retired hero, who discovered the forsaken boy and took him under his wing. Driven by an unyielding obsession with magic that had carried over from his former existence, Ash threw himself into grueling training day after day, convinced that sheer effort would one day unlock the power he so desperately craved. Yet even after eleven years of relentless discipline, standing at the cusp of adulthood at sixteen, not a single spell would answer his call—and his mentor could only offer grim resignation. What Ash never realized, however, was that his relentless physical conditioning had forged something far beyond ordinary strength. Unbeknownst to him, the fists he had honed through countless sleepless nights now carried enough force to crush the Demon Lord in a single, devastating blow—a truth that would soon overturn the very foundations of a world that had written him off as powerless.