Each episode's mystery is solved within that short time span, but unlike typical detective shows, this comedy features a slow-witted sleuth named Rokuro Kurama. While viewers will be able to identify the criminal right away, Kurama constantly comes up with incorrect theories, leading him to always accuse the wrong person. The show's name comes from its time slot (Saturday nights at 11:10pm), which runs a total of 33 minutes after commercial time is subtracted.

就算案件能在5分钟内搞定也“必须拍满33分钟”。同时花33分钟引导案件解决（预定）的就是33分侦探，也就是鞍马六郎。每一回出现在案发现场的33分侦探，都会指着看似毫无关联的人说“你就是犯人吧！”，周围的人就会反驳他说“绝对不是！！”，而他这时会展开独特的推理。其推理虽然有一贯推理剧的尖锐视角来推动剧情，但结果也可能隐含着一开始大家就认为可疑的人物是真正的犯人这种荒诞的结局。

总而言之就是“随性”。 33分侦探弥漫的“随性”气氛中，侦探的推理总是再最后一刻才正中靶心，这种紧张感在一般的推理剧中是感受不到的，可以说是史无前例的“脱线推理剧”！