Regression of the Manaless Sword God

In a world where mana reigns supreme, talent determines everything. The moment a person awakens their elemental affinity, their future is set. Mages stand above all others, while those born without talent are cast aside. Ethan was born with nothing. No affinity. No mana. No future. Labeled worthless in an era where humanity wages an endless war against monsters pouring from dimensional gates, Ethan gives up on ever becoming a mage and dedicates his life to the sword instead. Through relentless training, countless battles, and unimaginable bloodshed, he rises from the weakest man alive to become the strongest swordsman the world has ever known. Yet even that strength wasn't enough to protect what truly mattered. After facing the Demon King in humanity's final war, Ethan is left with nothing but regret. His comrades are dead. The world has fallen into ruin. And the victory he sacrificed everything for feels utterly meaningless. As death closes in, Ethan opens his eyes once more... Back to the day of his Affinity Test—the day his life first fell apart. Armed with memories of the future, unparalleled swordsmanship, and a second chance to change his fate, Ethan swears to protect everything he once lost. In a world where mana is absolute, a man born without mana will rise to become the Sword God.