Labyrinth of the Blue Witch III (蒼き魔女の迷宮篇III Aoki Majo no Meikyū Hen San) is the fifteenth episode of the Strike the Blood anime.
Yuuma's goal was to use the Fourth Progenitor's magic power to free her mother from the prison barrier. In accordance with her plans, the prison barrier appears above the ocean's surface near Itogami Island.
- La Folia & Yukina vs Octavia & Emma. (started and concluded)
- La Folia & Sayaka vs Octavia & Emma. (started and concluded)
- Kojou (Yuuma's body) & Yukina vs Yuuma (Kojou's body). (started and concluded)