Synopsis: The Unusual Life of a Retired Demon King

Despite being a former demon king, Kurosu Kai is a devoted father who stands out from the crowd. Due to their world's destruction a decade ago, he and his kind moved to the human realm. Since then, he and his daughter Hana have been relishing a placid existence in this unfamiliar land. Yet, their tranquil life is in danger when Kai's long-time rival emerges once again.