Labyrinth of the Blue Witch I (蒼き魔女の迷宮篇I Aoki Majo no Meikyū Hen Ichi) is the thirteenth episode of the Strike the Blood anime.
Itogami Island's tourist industry flourishes as the season of the annual Halloween Fest draws near. Kojou reunites with his childhood friend Yuuma Tokoyogi for the first time in four years, but Yukina and Asagi are not pleased to see the intimate friendship she shares with him. Meanwhile, when the Meyer Sisters suddenly appear at the Keystone Gate, the "witch of the void," Natsuki, finds herself in danger...
- Le Bleu