In a terrifying world where dragons stand above all other creatures, Ragna lives with one painful mission: protecting the person he promised never to lose. The balance of this world is controlled by unstoppable dragon forces, leaving humans struggling against overwhelming threats. For Ragna, that battle is not only about survival—it is about keeping a sacred promise.Ragna’s greatest tragedy arrives when he loses the very person he dedicated himself to protecting. The moment shatters his heart and leaves him facing a future filled with regret. His failure becomes the force that drives him forward, as the memory of his promise continues to haunt him. Instead of accepting his fate, Ragna searches for a way to change the ending written for him.