In the sixth episode of Shiki , titled "Sixth Skull," the mysterious epidemic in Sotoba intensifies, causing Dr. Ozaki great frustration while Natsuno begins to suspect the supernatural after witnessing strange occurrences with a deceased villager. The episode highlights a growing divide between scientific and supernatural explanations, with the Tanaka children investigating the Kirishiki mansion and Masao's condition worsening. You can find more details about this episode on the Shiki Wiki or IMDb . Episode 6 - Shiki Wiki | Fandom