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In the present, murders are solved not by investigations, but by memories. Using the removed brain of a victim, the members of Forensic Investigation Office Section Nine examine the person's last thoughts to determine a suspect and motive in the case. Many oppose the violation of their loved ones' private and personal memories; but what they don't understand is that behind the scenes, even the investigators themselves are often conflicted with their deeds. Aoki Ikko is one such man who struggles to overcome his own mental doubts about his profession, while trying his best to take down those responsible for the crimes.