Just moments after the demon king’s defeat, Countess Romelia is publicly stripped of her engagement by Prince Henri, her former fiancé and the hero of the party. Dismissed as useless alongside his new companions—the saint Elisabeth, the sage Ekaterina, and the swordswoman Ryoki—Romelia is sent home in disgrace. What her betrayers do not realize is that she secretly possesses a miraculous power called Grace, which bestows extraordinary luck. The setting is a medieval fantasy kingdom recovering from a long demon war, yet even with the demon king fallen, his forces still roam the land, enslaving villagers and occupying territories. Returning to her homeland of Cashu, a remote and ravaged region, Romelia finds her people enslaved and faces overwhelming odds: she has no army, no healers, no funds, and only raw, inexperienced recruits. Rather than surrender, she uses the skills she honed while following the heroes—trade, negotiation, finance, and intelligence—since she possesses neither magic nor physical strength. Romelia seizes fortresses from local lords to build her forces, negotiates with the church for healing support, secures funds through merchant deals, and has her soldiers gain experience by hunting monsters. A notable early narrative arc follows her campaign in Cashu, where her novice troops clash not only with ordinary demons but also with a new, intelligent race of malicious demon soldiers that prove to be their true enemy. Throughout the story, Romelia must rally her loyal followers, confront the former companions who abandoned her, and prove that the kingdom’s true savior is the woman they cast aside, all while fighting a desperate war in the wake of mankind’s hollow victory.