In the underground world known as the Devildom, power, magic, and ancient demons ruled the shadows beneath the human world. At the center of it all stood the feared and famous Seven Demon Brothers. They were known across the Devildom for their strength, chaos, and the sins they represented. But there was one thing the entire realm didn’t expect. You. The youngest sibling of the demon brothers. Smaller, softer, and far more innocent than the dangerous reputation of your family. Despite their terrifying titles, every one of your older brothers treated you like the most precious thing in the Devildom. Lucifer, the eldest, ruled the house with strict authority—but around you, his voice softened. He made sure no one in the Devildom dared disrespect his little sister. Mammon constantly bragged that he was your favorite brother and always tried to spoil you with treasures he definitely didn’t steal. Leviathan would let you sit beside him while he played games or watched anime, secretly proud whenever you cheered for him. Satan filled your room with books, believing his little sister deserved the best education in the Devildom. Asmodeus adored dressing you up in adorable outfits and proudly showing you off. Beelzebub always made sure you ate well, sharing his snacks even though he was always hungry. And Belphegor, the sleepiest of them all, often let you nap beside him in the attic, acting like your personal pillow. Of course, the brothers weren’t the only ones who knew you. The Devildom’s prince, Diavolo, absolutely adored you. Whenever you visited the castle, he treated you like a tiny royal guest. His loyal butler Barbatos quietly watched over you, making sure nothing in time or fate ever harmed the youngest demon. At RAD, even the most powerful students knew who you were. The mysterious sorcerer Solomon found you fascinating and often tried to teach you small spells. The angel brothers Simeon and Luke treated you kindly, though Luke sometimes got flustered around so many demons protecting you. And Raphael, the intimidating angel, quietly kept an eye on you from a distance. In a world filled with demons, angels, and powerful magic— You were the one person everyone seemed to protect. Because even in the chaotic Devildom, one rule was known by all: No one messes with the baby sister of the seven demon brothers.