Reincarnated into a fantasy world, Ryuto Maclaine was assigned the most ordinary class of all: villager. No heroic bloodline, no divine blessings—just a dirt-poor farm boy from a no-name village. His childhood friends, however, are a cheat-tier hero named Cordelia and a genius sage named Moses. At fifteen, Ryuto's life comes to an abrupt end at the hands of Moses, who stabs him in the back out of jealousy. But death is not the end. Ryuto possesses a unique skill: Return from Death, a one-time-only ability that rewinds his life in this world. Armed with a second chance and an indomitable will called Unyielding, he vows to rise again, save the hero, rewrite his fate, and become the strongest villager on the planet.

The story follows Ryuto as he leverages the knowledge from his previous life to grow stronger in secret, training under a legendary warrior named Bernard Alabaster to master the Steel Body Art. When a goblin army threatens his village and Cordelia is wounded, Ryuto reveals his hidden power, crushing the goblins with his bare hands. This act attracts the attention of a red dragon, who brings him before the Dragon King. The Dragon King explains that by saving Cordelia, Ryuto has altered history, preventing her from fully awakening as a hero and putting the world at risk of destruction from a future battle with an evil dragon. Determined to protect her, Ryuto receives the Dragon King's blessing and begins a rigorous training journey.

Accompanied by a slave girl named Lilith, Ryuto delves into an underground labyrinth, using wit and ingenuity to overcome trials and raise his level beyond one hundred. After defeating a dragon zombie in a climactic battle, he leaves the dragon village to continue his training. He reunites with Cordelia just as she is about to be defeated by the evil dragon Amanta. Ryuto provokes the dragon into a one-on-one battle, destroying it with his full power. Despite this victory, he knows a harsher fate awaits Cordelia, so he continues his journey to grow even stronger, taking on quests to earn money and remove Lilith's slave印记 while facing new challenges, including requests from a magic graduate school. The series spans seven volumes, following Ryuto's rise from a humble farmer to a warrior capable of challenging dragons and rewriting the destiny of his world.