Serial killers are people who continue to commit bizarre murders unavoidably, driven by abnormal psychological desires that already exist within them. It can be said that it is carrying the fate of killing people.
The main character of this story, Erimine Sou, lost his mother when a serial killer suddenly broke into his house when he was a child.
In order to understand the incomprehensible fear, the protagonist continues to face the fact by writing a "murderer novel", but one day he receives a letter.