Masaaki Ashiya serves as the chief of the Anti-Demon Bureau, alternatively called the Degenerate Bureau. This organization operates from Baylong City, an artificial Pacific island, and handles incidents involving entities classified as D-Hazards or D-Disasters. Physically, he is an adult male with brown hair reaching his ears. He consistently appears wearing a suit, tie, and glasses, with the notable visual trait of his eyes being perpetually closed.