After being admitted to the police school, the middle school student Mada, during the internship, participated in the series of reconnaissance missions. In the process of crime investigation, he did not believe in the authority of artificial intelligence detectives, but was obsessed with traditional investigative methods. By chance, the motor got acquainted with a giant rat, Jiji, who escaped from a lab. Jiji's wisdom was artificially stimulated with distortion in the lab. With the help of the young partner Jiji, the detective of the young boy gradually surfaced. However, in the reconnaissance of another case, the new situation emerged has repeatedly overturned their reasoning. Who is manipulating this? Where is the real murderer? Robots, artificial intelligence, man-machine wars ... Is it a human-made robot or a "semi-robot" that wants to control humans?