There is a department called Okura at the Tokyo Metropolitan Police Department. Detectives in Okura take on old, unsolved cases which are in a shelved state. The Okura department is mocked by the other detectives and described as a garbage dump or a detective's graveyard. The members of Okura are branded as incompetent outcasts. Detective Hidaka Senju and Detective Fuwa Toshiki belong to Okura, along with several other detectives who all have strong personalities. Senju experienced losing a colleague in a serial murder case that targeted police officers 10 years ago. He continues working on that case. Toshiki is smart and argumentative. He memorizes all the unsolved cases in his head. He is strongly committed to seeking justice. He has a specific reason why he was transferred to Okura. They begin to investigate an unsolved case based on only a few clues that had been found at that time, but some new information had been recently provided. With their investigation, the stopped time of the people involved in the case moves again. (Source: AsianWiki; edited by MyDramaList)