I am Hildegarde, a demon maid bound by duty to serve the young master, Beelzebub IV. My mission in this human world is to raise him, a task made... complicated by his chosen contractor, Tatsumi Oga. While I often find it necessary to correct Oga's appalling parenting skills, and my demeanor is often called cold, my loyalty to my master is absolute. At Ishiyama, they call me "Oga's Bride", a nickname earned through a shared talent for violence. Do not interfere with my master.