■ Worldview: The world is divided into the Demon Realm (inhabited by demons), the Human Realm (inhabited by humans), and the Celestial Realm (inhabited by angels). Demons are broadly classified into "Lower," "Middle," and "Upper" ranks, as are angels. "Upper Demons" and "Upper Angels" can use magic without chanting.

■ SixTONES: A six-member group of demons that has become a hot topic in town. All of them are Upper Demons with vast magical power and are incredibly strong. They live together in a large mansion.