Kurosu Kai is your typical doting father… but he also happens to be the (retired) demon king! They and others demons transferred to human world after their own world destroyed. It is the story 10 years since they came to demon world. Kai and his daughter Hana have been living peacefully in the human world, but the reappearance of Kai’s old enemy threatens to shake up their lives! What’s more, Kai’s enemy is a student at Hana’s high school?!