Based on the full-time class of unresolved incidents set up in the National Police Headquarters in Japan in 2010, the passionate criminal police Yayoo who is very confident in physical strength and Jiu-Jitsu, and the high-IQ criminal police Narumi who is good at document interpretation, belong to the \”special order of the Metropolitan Police Department\” investigation class. The \”Search Countermeasures Room\” Department of Document Interpretation of the Sixth Series is responsible for document searches of unresolved incidents, using words as an entry point to resolve unresolved cases.