The mismatched pair of a compassionate retro-style police inspector and his cool modern-style partner take on unsolved cases that are about to go cold in this humanist mystery series.

With the removal of statutes of limitations, criminals now have to keep on running forever. This reform in the law, which means that anyone who is caught will definitely be prosecuted, is ideal for the families of the victims…or it should have been. However, reality isn’t so simple. In the past, cases that were getting close to the statute of limitations were often taken up by the media, which could lead to new information suddenly coming to light. Now, without that excitement, almost all such cases go cold. When the statute of limitation for murder was 15 years, many members of the victims’ families would use that as a turning point to move on, but now they have to carry that incident with them for the rest of their lives, and some find that exhausting.
There is a department, OKURA, which handles cases which have remained shelved as a result of abolishing the statute of limitations. Two investigators there, Senju Hidaka, a retro-style investigator with a deep sense of compassion, who believes in the importance of hitting the pavement, and Toshiki Fuwa, a cool modern-style detective who focuses on saving time and being efficient, solve cases on the verge of going cold. The pair investigate using the handful of clues that were left by investigations performed at the time of the incident, along with new tips that have come in after a long time. Sometimes working with their minds, sometimes with their bodies, their investigations will help time to start moving forward once again for those who have been affected by the incidents…