Problematic for Demon King Ahriman is his daughter Dou's tendency to love everyone. In light of this, Ahriman has put his plans to conquer the world on hold because he fears her kindness is unbecoming of her lineage. Dou has a penchant for making friends, aiding others, and bringing joy to all creatures, even their enemies, the humans.
To address this concern, Ahriman has chosen to praise Dou for her virtuous acts rather than chastise her. In collaboration with his assistant Jahy, tasked with overseeing Dou's upbringing, the duo aims to eradicate her benevolent disposition, transforming the Demon King's daughter from a charming, lovable child into a heartless, malevolent demon.