Luck, a simple, unassuming knight warrior, finds himself with his team of heroes defending the front lines against the demon army. But when retreat becomes the only option to save his comrades, he makes the foolishest decision of all: staying behind and acting alone as bait. For ten long years, Luck fights tirelessly in relentless carnage against endless hordes of bloodthirsty monsters, surviving only through sheer willpower and honing his swordsmanship to monstrous heights. When he finally manages to slay every last demon and return to the human world, he discovers that his feat has transformed him into a legendary myth, a godlike entity feared and revered by all. With the outsized powers accumulated over a decade of massacres and a body transformed into a veritable war machine, our veteran tries to enjoy some well-deserved rest, but the peace is short-lived: conspiracies, new threats, and arrogant nobles will learn at their expense what happens when you provoke the man who defeated hell alone.