The Fugitive Fourth Primogenitor (逃亡の第四真祖 Tōbō no dai yon shinso) is the eleventh novel of the Strike the Blood series.
A New Year on Itogami Island is right around the corner, and for Kojou and Yukina, that means cutting off their contacts and returning to the mainland for a top-secret rescue mission. Coincidentally, this also means zero contact between Yukina and the Lion King Organization. Can the fearful duo see their mission through to the end, or will they be overwhelmed by an unexpected enemy?
- Chapter One: Countdown to the New Year
- Chapter Two: Shadow of Intrigue
- Chapter Three: Escape from the Demon Sanctuary
- Chapter Four: The Witch of the Void
The volume was adapted into episodes 4-5 of Strike the Blood II.