Masaya is a college scholar, however he attends a college that is not his best college. His days are usually gloomy. At some point, he receives a letter from serial killer Haimura. He was convicted for 9 murders and obtained the dying penalty. Again when Haimura was committing his murders, he ran a bakery retailer. At the moment, Masaya was a middle-school scholar and a buyer at his bakery retailer. In accordance with the letter, Haimura confesses to having dedicated eight murders, however he insists that he didn't commit the final homicide. Masaya begins to analyze the final homicide case involving Haimura.
