雾山修一郎（小田切让 饰）是在时效管理课工作的警察。由于部门的工作十分清闲，让雾山他的同事们整日都无事可干。某一天，当大家都谈到自己的爱好时，发现自己没啥爱好的雾山决定要发展自己的一项爱好，于是他把目标盯住了时效档案。决定调查那些过了时效的案件，寻找出其中的凶手。在交通课工作的三日月静（麻生久美子 饰）因为暗恋着雾山，所以时不时串门到时效管理课，借机找机会和雾山接触。 雾山和三日月在一堆失了时效的案件中，揪出了一些谜点，与那些犯人周旋，然后展开了别样的推理故事。伴随着各种冷笑话，最脱力系的推理故事就此开始。Kiriyama Shuichiro works as an information management officer in the prefectural police station. As he is very observant and has interest in the unresolved cases which have gone past the legal time frame (statute of limitations) i.e. the culprit cannot be charged even if he/she is caught, he investigates the cases without permission with the aim of "confirming" the culprit only. Some characteristics of this character would be his dark green spectacles, his wallet containing 20,000 yen at all times and he likes udon and nyuumen.
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