Natsuki Amakusa , a detective from the Tokyo Metropolitan Police Department's First Investigative Division, and Yuya Shiki, a high school student with an eye for spotting murderers, are involved in the murder of a newspaper reporter, Tadafumi Yamada, who was stabbed to death. The incident was investigated. Although the culprit was safely arrested, Natsuki feels uncomfortable when he confesses that he had no intention of killing the victim. And what is the "certain purpose" of detective Hozumi Yakumo who appears in front of Natsuki and Yuya at the crime scene? A full-scale crime suspense story that shakes the nation begins.