Among the qualities that a criminal policeman should have, Katayama Yoshitaro (Aiba Masaki) does not have nine out of ten. The decisiveness, courage, and boldness that should be possessed by Katayama have become various weaknesses that mark him as a coward, such as fear of heights and phantom phobia. Katayama's weaknesses made him deeply realize how unreasonable it was that he was actually a policeman. So Katayama, who was thinking about submitting his resignation all day, stopped because his fanatical reasoning enthusiasts, his brother Katayama Hiroshi (Fujiki Naoto) and his decisive sister Katayama Harumi (Omasa Aya), advised him not to give up the police profession. Katayama, who did not dare to resist the two, had to grit his teeth and persist. Until one day, things took a turn for the better. On the road, Katayama met a strange three-color cat. This cat opened his subsequent journey of solving cases as if he had divine help... This drama is adapted from the mystery novel of the same name by Akagawa Jiro.