The content tells the story of a killer who enjoys mixing milk and human blood together to drink. Is he a person with a special illness, or is he the legendary immortal vampire? In City C, there have been four consecutive cases of rape and murder, and the victims are all white-collar workers between the ages of 25 and 30. Is this a revenge killing, or a simple crime of passion? A high-achieving graduate student suddenly attacks his classmates as if he has gone mad. Is he hypnotized by someone, or has he been planning to kill and silence others for a long time...