Ezra Ashenlocke never asked to become a sacrifice. Betrayed by his own parents to spare his twin brother, he awakens into the Trial of Steel—a brutal proving ground where children become soldiers or corpses. The only commandment echoes through the nightmare: "Assemble your guns. Kill or be killed." Survival demands more than desperation. Trapped in a relentless massacre, Ezra discovers an unexpected edge: fragmented memories bleeding through from another existence. He remembers being a weapons engineer, a war-scarred veteran who spent years crafting instruments of destruction in a parallel world. Those stolen echoes transform him from hunted prey into a formidable predator. Armed with ancestral knowledge and fierce determination, Ezra embraces his sinister inheritance. He battles through the deadly trials ahead while pursuing mastery of Gun Alchemy throughout Britannia's mystical Country of Alchemy. Each lesson learned, each enemy conquered—they forge his evolution from victim to legend, teaching him that survival is only the beginning.