Beelzebub-jou no Okinimesu mama.

Beelzebub rules Pandemonium, where former angels now live and work as demons, and her name is supposed to inspire fear. Her new attendant, Myurin, quickly discovers a far less intimidating truth: his elegant ruler is a softhearted woman obsessed with anything fluffy, and much of her dignity disappears the moment official business ends. Myurin tries to preserve the image of the perfect sovereign while becoming increasingly charmed by the person behind it. Surrounded by equally peculiar demons and one awkward everyday incident after another, his dream job turns into a gentle comedy in which affection grows long before either of them knows what to call it.