In 1989, it was Showa 64 in Japan, but the year did not last long. With the death of the emperor, the brief Showa 64 came to a hasty end. In these limited seven days, there was a kidnapping of a young girl somewhere. The kidnappers demanded a huge ransom of 20 million yen and skillfully dealt with the families of the victims and the investigators. Although the victim's father (Masamin Nagase) paid the ransom according to the agreement, the kidnapper brutally killed the girl. As Japan is at a critical moment of the transition between the new and the old, the case code-named "64" has not attracted much attention, and even more than a decade later, this outstanding case is still an unforgettable knot for many investigators. Sanshang Yixin (Sato Hiroshi), who was handling the case at that time, is now serving as a propaganda officer at the Gunma prefecture police station, dealing with superiors and the media all day long. The final statute of limitations of "64" is approaching, and people seem to remember this enigmatic case again. This film is based on Hideo Yokoyama's mystery novel of the same name.