This drama tells the story of the humane detective Showa and the ruthless detective Reiwa, who challenge a long-unsolved incident that is actually on hold.The generation gap partner between Showa detective Chiju Tobi, played by Sorimachi, and Reiwa detective Fuwa Riki, played by Sugino, will rely on some clues to get closer to the truth of the incident that is about to be revealed.

Chiju Tobi (Takashi Sorimachi) was originally a shrewd and passionate detective with keen insight and adaptability, but due to a certain incident, he was demoted to the Special Investigation Information Management Office of the 1st Investigation Section of the Metropolitan Police Department, commonly known as “Okura”.This department is mainly responsible for inputting huge amounts of data related to unresolved incidents. Although it has investigative powers, it is also known as the "Graveyard of Criminal Police" within the Metropolitan Police Department.

In addition to Senju, the department also includes Rinko (Mai Shiraishi) who once worked in the Organized Crime Countermeasures Department, Taizo Washizawa (Takeji Ukaji), a veteran detective who is about to retire, the head of the department who likes to gamble, Gakuta Oda (Jun Hashimoto),Ex-father A. Kiri Makihara (Sayaka Aoki) and hacker Ray Yoshioka (Washiro Maeda) who was active in the cybercrime countermeasures room.The Intelligence Management Office welcomed a new member, Fuwa Echi (played by Sugino Haruka) today.Although Riji is known as an excellent detective, he seems to be assigned to Okura for some reason. Kiri and Lei are curious about him.

At the same time, the Intelligence Management Office received an email.The sender was Shusaku Yasuge (Daisuke Kuroda), the suspect in the murder of an elementary school student that occurred 12 years ago. At that time, he could not be arrested due to insufficient evidence.Since the message was sent by the suspect himself, Okura members started talking about it.Qianju, who was in charge of the investigation of the incident at the time, went to the forest where the victim's body was found with Riji and Renzi...