The Demon King's Journey of Atonement and Quest for Coexistence: A Second Attempt at Peace Long ago, the love between the Demon King and the Princess ended the war between demons and humans, bringing peace to the world. Together, they traveled far and wide, seeking safe havens for demons to live in harmony. Eventually, they settled down for a quiet life alone. However, after 60 years, as the Princess lay on her deathbed, she confessed, "It was a mistake to release the demons into the world." Heartbroken, the Demon King sets off on a journey once more, determined to atone for his past actions. Facing the reality of their past ideals, he begins a new quest to truly achieve a world where humans and demons can live together.