Akatsuki no Ageha朱月のアゲハ ; 朱月的羽音 ; Aketsuki no Ageha ; Diluculum Papilo

Once again, the police are baffled by the serial killings of several young women. Kudou, a detective, is referred to a young girl by a friend. But this girl isn't what she seems - Kudou saw her at the crime scene. Apparently she's a vampire!!