Ragna spends his days as a low-ranked dragon hunter, content to live in the shadow of his prodigy partner, Leonica, until a haunting vision from his future self shatters his reality. This grizzled, broken version of himself transfers decades of accumulated power and a desperate warning of the catastrophic tragedies that will soon claim everyone he loves. Armed with the strength to slay titans but burdened by the memories of a timeline he must prevent, Ragna leaves his old life behind to hunt the world's most terrifying Dragon Monarchs. He forms a precarious and deadly alliance with Crimson, a manipulative traitor to the dragon race who shares his cold, genocidal obsession. Together, they navigate a brutal landscape of betrayal and overwhelming odds, where Ragna must sacrifice his own humanity to match the ferocity of his supernatural foes. Ragna's soul burns with a singular, unyielding purpose: to hunt down every last dragon and ensure that the apocalyptic future he witnessed is erased from existence forever.