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?