For sixteen years, Hiroshi Yukigami believed he was nothing more than a prince of the Eastern Region. He had a loving family, loyal friends, and a peaceful future ahead of him. But when a hidden truth from the Demon Extinction War is revealed, Hiroshi learns that his mother was a demon-one of the last survivors of a race humanity believed was wiped out long ago. Now caught between two worlds, Hiroshi must decide who he truly is. As whispers of surviving demons begin to spread and an ancient enemy rises from the shadows, the fragile peace that united the Four Regions starts to crumble. Meanwhile, a powerful half-demon seeks to rebuild the fallen Demon Empire and restore the fear that once ruled the world. With the Arctic Knights hunting every trace of demon blood, Hiroshi finds himself at the center of a conflict that began long before he was born. Will he protect the world that raised him? Or will the blood of demons determine his fate? The age of demons has ended. But its last heir still lives.