Yoshitaro Katayama (Masaki Aiba) became a police detective after having followed the will of his father who had been known as a great detective.  However, Yoshitaro can never step into murder scenes because he faints whenever he sees blood, and criminals are able to easily slip away because he is afraid of heights.  He also has phobias of women and ghosts.  Moreover, he hates to doubt people more than anything, so he happens to believe whatever people say.  Thus, Yoshitaro has tried, in vain, to quit his job a number of times in the past, but his brother Hiroshi (Naohito Fujiki), who loves mystery novels, and his super active sister Harumi (Aya Omasa) always manage to convince him to remain as a detective.

One day, hopeless Yoshitaro finds a calico cat that somehow understands what people say and sometimes shows great reasoning power.  With the help of strange hints given by this cat, Yoshitaro luckily succeeds in solving the cases.

This is the first TV drama series based on the legendary hit mystery novel series which has sold more than 28 million copies in Japan.  Don’t miss this hilarious mystery drama, featuring this strange duo of an incapable detective and an enigmatic cat!

片山义太郎（相叶雅纪饰）虽然继承了过去曾是名刑警的父亲遗言成为了一名刑警，但他因为一看到血就气绝，不能踏入杀人现场，又因为有恐高症而使犯人逃跑。甚至有女性恐慌症和幽灵恐慌症。最重要的是从来不会怀疑别人，不管谁的话都会相信。这样的义太郎迄今为止不知有多少次想辞去刑警工作，但每次都被酷爱推理小说的哥哥浩史（藤木直人饰）和超行动派的晴美（大政绚饰）所鞭策，勉勉强强持续着不断失败的刑警生涯。

这样无可奈何的片山刑警，有一天偶然邂逅了一只三色猫。那只猫竟然能听懂人类语言，时而发挥出色的推理。义太郎通过三色猫给出的奇妙提示，联手解决各种疑难案件。

该剧改编自累计销量突破2800万册的超人气推理小说，首次以电视连续剧亮相。这是一部具有各种弱点的刑警和神秘三色猫的异色搭档展开的搞笑悬疑剧。