Travelling Around Yamatai said:
Most every municipality has its own police agency. The Kyoto Municipal Police, or the KMP, is the largest. Some small prefectures, such as Gemis and Stars, have law enforcement on the prefecture level, as the municipalities within those prefectures aren't big enough to support stand-alone agencies. There are a few inter-municipality agencies, but they're specialized and rarely used.
The National Police itself has two sets of staff — a core group of special agents, detectives and support staff that are hired from a specific agency or from outside, and a secondary set of rotating officers that draws from the municipal law enforcement agencies. The secondary set takes up-and-coming detectives and officers from those municipal agencies and puts them on a one- or two-year tour-of-duty with the YNP. This allows the YNP to have a knowledgeable, emergency-ready body of agents to draw on in case of a crisis.
Notable police agencies cooperating with the YNP include the Kyoto Municipal Police, the Malifar Police Department, the Jskita Municipal Police, and the Uesureya Security Agency.