Fifteen years have elapsed since the war between humans and demons commenced. Dissatisfied with the slow progress into the Demon Realm, the Hero abandons his companions to rush ahead toward the Demon Queen's castle. Upon arriving at the royal residence, the Hero makes a startling discovery: the Demon Queen is not only a woman of unparalleled beauty, but she also seeks the Hero's help. Confused by this unexpected turn of events, the Hero refuses to ally with his enemy, claiming that the war waged by the demons is tearing the Southern Nations apart. However, the Demon Queen rebuts, arguing that the war has not only united humanity but also brought them wealth and prosperity, providing evidence to support her claims. Furthermore, she explains that if the war were to end, the supplies sent by the Central Nations in aid of the Southern Nations would cease, leaving hundreds of thousands to starve. Fortunately, she offers the Hero a way to end the war while bringing hope not only to the Southern Nations, but also to the rest of the world, though she will need his assistance to make this a reality. Finally convinced, the Hero agrees to join his now former enemy in her quest. Vowing to stay together through sickness and health, they set off for the human world.