Ragna Crimson (Japanese: ラグナクリムゾン, Hepburn: Raguna Kurimuzon) is a Japanese manga series written and illustrated by Daiki Kobayashi. Set in a world where dragons reign over land, sea, and sky, the story follows Ragna, a determined dragon hunter who seeks to defy fate and gain the strength to fight back. Teaming up with the enigmatic Crimson, who shares his goal of annihilating the dragon monarchs, Ragna embarks on a relentless battle where failure is not an option.