Serafall Leviathan from the series High School DxD(formerly Serafall Sitri)-one of the four demon lords and the elder sister of Sona Sitri. Responsible for the foreign affairs of the Underworld.Serafall looks like a beautiful girl with black hair in the form of two ponytails, blue eyes and big breasts.Serafall is cheerful and childish.
Events after the 21st volume of the ranobe battle with Trihexa in the Isolation Barrier Field:A reference to the draft of an exclusive closed volume "Denouement".