The Amphisbaena (天使炎上 Tenshi enjō, Angel's fire) is the third novel of the Strike the Blood series.
Kojou and Yukina join forces with Natsuki Minamiya to protect Itogami City from a new threat from the skies—but even Kojou's Beast Vassal can't take this new foe on, and who should rescue them from their predicament but Kojou's sister's friend, a silver-haired girl named Kanon Kanase! But when Kanon disappears, Kojou and Yukina may find that there are some problems not even the world's mightiest vampire can solve!
- Chapter One: Friendship, Love, and Other Circumstances
- Chapter Two: The Saint on the Roof
- Chapter Three: The Island of Exile
- Chapter Four: Faux-Angel
- Chapter Five: The Amphisbaena
The volume was adapted into episodes 9-12 of the anime.