Half of the World

After a long journey, the hero finally reached the Demon King's castle. Brandishing his beloved sword and raising clouds of dust, the hero should have struck at the Demon King with lightning-fast speed and unwavering determination. But in the next instant, he doubted his own ears at the words she uttered. "—I'll give you half the world." The greedy hero couldn't help but stop in his tracks, and suffered his first defeat in the final battle. It seemed humanity's fate had come to an end—or so it appeared. "I'm... not dead?" ...The hero was alive. Why did the Demon King spare the hero's life? Why did the Demon King burn the hero's hometown? What is the hero's great secret? Through the "forbidden love" between these two, the world undergoes a tremendous transformation... After an eternity has passed, what has become of the half of the world that the hero obtained?