At that time the ambassador from Transylvania came to Yuugen Kaisha, where Kisaragi Ayaka was. He said that the current incidents were caused because Dracula's coffin, which was his country's national treasure, got into the hands of a Japanese investor. He wanted them to investigation of this case to be done secretly because he wanted to hide the dishonor of selling the national treasure.
Meanwhile Karino of the police department section U knew that this wasn't just an ordinary crime by a weirdo. So he called on the specialist Ayaka. The join investigation between Yuugen Kaisha and the police department began.
With the help of Suimei (a member of Yuugen Kaisha), Ayaka and Karino were able to determine the location where the next incident was going to occur. They were able to meet up with the vampire, but he got away. They were able to save the victim's life. When they went to visit the girl in the hospital, a strange master of a coffee shop also appeared. Ayaka thought that he was the vampire and started going after him. But then another victim arrived at the hospital.
Were there not 1, but 2 vampires!?