Knocking on the Door of the Secret Chamber

There is a detective agency that only knocks on doors without a doorbell, two young detectives who are both partners and rivals, a beautiful high school girl who works part-time as a cook and cleaner, a policewoman who never leaves her mouth for snacks, and a mysterious man who regularly appears in the second-hand bookstore...a group of seemingly weird people, but the cunning murderer has nowhere to hide. Katazashi Hyōsame, who specializes in motive analysis, and Gotemba Kaori, who focuses on the study of crime techniques. Even if it is a case that leaves no clue, the two detectives with a clear division of labor can solve it through seamless cooperation and tacit understanding!