Abysmal Anime Details and Episodes Ruscilester, a nightmare world where seven vampire sisters slaughter each other for supremacy. The key lies in "The Demon's Formula" — a conceptual weapon… Series info Watch free DetailsFormatMangaStatusAiringSourceOriginalCountryJapan GenresActionFantasyHorrorSupernatural TagsVampireFemale ProtagonistConspiracyUrban FantasyDemonsSeinenPrimarily Female CastAmnesiaGoreHenshin RecommendationsBibliomaniaNull MetaKekkai SensenKuroshio Current