Since ancient times, an unending war between humans and demons ravaged the world, with darkness threatening to consume all. However, after centuries of relentless conflict, the tide finally turned when humanity, with the divine intervention of the supreme gods known as the Devas, stood victorious over the demon hordes. Yet, just as peace seemed within reach, the Demon Lord unleashed a final, devastating act—one that altered the balance of the world forever. The war that should have ended in the annals of myth and legend instead spilled into the modern era, its dark tendrils reaching through time, entwining the fate of a new generation. Enter Aramiya Ryuu, an ordinary high school student—at least on the surface. Unbeknownst to him, his bloodline harbors a secret legacy linked to the ancient battles of gods and demons. When a series of strange, ominous events begin to unfold in his quiet town, Ryuu is thrust into a world of mystery, magic, and danger. Now, alongside unlikely allies and armed with powers he doesn't fully understand, Ryuu must navigate the shadowy forces threatening humanity. The modern-day war against the cruel demons rages on, and Ryuu's journey to uncover his true destiny—and perhaps end the war once and for all—has just begun. With every step forward, he draws closer to unraveling the truth behind the Demon Lord's final act, and the dark secrets buried in his own past. Can Ryuu rise to become the hero the world needs, or will the demons finally claim victory in this ancient, everlasting war?