The time is the 21st century. In order to combat organized crime, which is rapidly becoming more high-tech and heavily armed, the "heavy armed riot police'' and the urban tank "Walker Corps'' have been established. However, as a result, the crime war continues to intensify. Taking the situation seriously, the Metropolitan Police Department sent in an experimental unit. Its name is the "Police Doll Squad" of the Shinfuchu Police Station of the Tokyo Metropolitan Police Department.