A quiet and polite girl with blue hair. Aoi is the reserved foil to Haruka and occasionally the voice of reason. She comes from a very rich and respected family, her grandmother is their private school's principal and the previous Angel in her position. She is also well attended to by a one-eyed warrior butler named Heinojou who has a habit of appearing out of nowhere to tend to her. Her alias is Blue Angel. She attacks using a magical bow and arrow called Angel Arrow which can produce infinite arrows that can split upon firing.