Johan Librale, driven by the need to protect the woman he loves, commits the unforgivable act of killing the world's strongest hero. This deed instantly transforms him into a global enemy, pursued relentlessly by every power in existence. Johan possesses an overwhelming cheat ability: the power to rewind time when he is on the verge of death, a loop ability often referred to as return by death. However, this secret is quickly discovered by his enemies, and they begin deploying carefully crafted countermeasures to negate his advantage. Instead of facing a straightforward battle, Johan must now survive in a world where his greatest weapon has been anticipated and is being systematically countered by an array of assassins and exorcism executors sent to eliminate him.

The story unfolds in a fantasy world dominated by the authority of the Holy City and its exorcism executors, powerful individuals with unique magical abilities. The central figure in this conflict is Gretel, a saint and Johan's beloved, who is captured and held prisoner in a solitary castle within the holy capital. Determined to rescue her, Johan embarks on a dangerous infiltration, facing a gauntlet of increasingly cunning and powerful foes. Among the most formidable is the great exorcism executor Klainot, a master of teleportation who battles Johan within the prison itself using a barrage of gem-like projectiles.

Early in the series, after 578 loops, Johan manages to defeat a wind-ability executor, but this victory only cements the enemy's knowledge of his time-rewinding power. The narrative is driven by an escalating intellectual battle: as Johan's ability is fully exposed, his enemies adapt by creating scenarios where dying is impossible, preventing him from resetting. Each volume introduces new executors and tighter encirclements, forcing Johan to rely on cunning, strategy, and assistance from allies like Gretel to break through seemingly inescapable situations. The conflict grows more intense with every victory, ultimately leading to a confrontation with the strongest executors, where the limits of his loop ability are pushed to their breaking point.