Fiesta For The Observers III (観測者たちの宴篇III Kansokusha-tachi no Utage Hen San) is the eighteenth episode of the Strike the Blood anime.
Kojou and Asagi take Sana on board Vatler's boat, the Oceanus Grave II, to protect her from danger. But Kojou's relief is short-lived as he is soon accosted by Vatler's beautiful young maids, and his stimulation is pushed very close to the limit when he ends up sharing a bath with Asagi...
- Dimitrie vs Broodt.(started and concluded)
- Sayaka vs Shtra D.(started and concluded)
- Kojou & Yukina & Sayaka vs Aya.(started and concluded)
- 5th Familiar-Upananda.
- 6th Familiar-golden snake.
- 7th Familiar-black/green snake.
- 8th Familiar-dark grey snake.