During the reign of the 11th Shogun, a series of supernatural incidents occur every night in the Edo Castle. A beautiful inspector appears with thunder and lightning to suck people’s blood and kill them. The examiner’s true identity is Amakusa Shiro, a young samurai from the Amakusa clan that was destroyed by the harsh Christian persecution of the Shogunate. Shirô sold his soul to the devil and became an evil spirit.