Era setting; London, England, 17th to 18th centuries
Plot: Peaceful London has encountered terrorist incidents, and many children of prominent families have mysteriously disappeared and died. The British side was extremely panicked and sent a special police force to investigate. The result was that a perverted murderer committed the crime, but they did not know who it was. At this time, a mysterious girl from Russia, Yekaterin, who claimed to be an adventurer and vampire hunter, came to the confused police. She said that a vampire had entered the city...