Maou no Moto Sakan wa Yuusha ni Tensei Shite mo Chuusei wo Sasagu

A powerful former Demon King, Baldo Barbados, ends the war between humans and demons and destroys the world. After his death, he feels regret for his six loyal Demon Ministers who died serving him. To give them a better chance at peace, he reincarnates them into a new world as beautiful female heroes. However, they still show the same loyalty to him, eager to conquer the new world and even act spoiled. Now reborn as students in an academy city where Baldo serves as headmaster, the former Demon Ministers continue to misunderstand his desire for peace, persisting in their ambitions.