Aurora was born without knowing her parents. She was raised by a group of nuns who found her abandoned outside their orphanage. Despite that, Aurora had a great childhood filled with love and with friends she made at the orphanage. As she gets older, Aurora starts thinking of her birth parents and the reason for the abandonment. When she was about to leave the orphanage and start her life as an adult, a man she never met before came to see her at the orphanage and told her that she was the heir to a once-famous family that dominated the world's financial hub. "Miss Aurora, you're the last surviving heir to the Larove's fortune."

Aeriin is just your normal highschool demon slayer. She goes to class, gets good grades, and manages to kill a few demons without breaking a sweat. Aeriin's family is the oldest and most powerful demon hunting clan, and they've owed their strength to the vampire who fights along side them. But when Aeriin's parents pass away, and she's forced to babysit the overly playful vampire. Will they become friends? Or end up slaying each other?