机动搜查队，简称“MIU”，在警察内部被誉为 “万金油”，是拼尽全力抓捕罪犯的专业搜查队伍，他们需要在24小时内解决各种案件。“警视厅刑事部第四机动搜查队”是作为警视厅劳动改革的一环创造出的一支临时部队。行动力出色但没有机动调查经验，也缺乏刑警常识的伊吹蓝，经常以超前思维来理清事件来龙去脉的的志摩一未，同隶属于第四机搜队，MIU404便是他们的号码。这两人成为搭档，一起解决案件。
机动搜查队404 (季节 1)
Episode 1 (集 1)
播出日期: 2020-06-26
运行时间: 59 min
概述: Tasked with joining a temporary mobile investigation unit, Kazumi Shima gains a new partner in Ai Ibuki, an officer with a troubled past.
Episode 2 (集 2)
播出日期: 2020-07-03
运行时间: 45 min
概述: After Ibuki senses something odd about a passing car, his suspicions are confirmed when he hears over police radio about a murder suspect on the run.
Episode 3 (集 3)
播出日期: 2020-07-10
运行时间: 45 min
概述: When the police have trouble catching the perpetrator of a series of prank calls, Ibuki boldly proclaims that nobody is fast enough to outrun him.
Episode 4 (集 4)
播出日期: 2020-07-17
运行时间: 45 min
概述: A shooting incident leads Shima and Ibuki to go in search of the victim, who they soon learn is carrying a huge sum of cash and has a criminal record.
Episode 5 (集 5)
播出日期: 2020-07-24
运行时间: 45 min
概述: Ibuki and Shima go undercover as convenience store clerks to prevent a robbery. However, their plan hits a snag when more than one store is targeted.
Episode 6 (集 6)
播出日期: 2020-07-31
运行时间: 45 min
概述: Having overheard someone call Shima a partner killer, Ibuki begins to probe into Shima’s past in a bid to uncover the secret he’s hiding from him.
Episode 7 (集 7)
播出日期: 2020-08-07
运行时间: 45 min
概述: Shima and Ibuki investigate a body found in a storage container. Jinba encounters a wanted felon while en route to a formal gathering with his family.
Episode 8 (集 8)
播出日期: 2020-08-14
运行时间: 45 min
概述: After investigating a body believed to be related to an unsolved serial murder case, Ibuki discovers that his mentor arrested the victim years prior.
Episode 9 (集 9)
播出日期: 2020-08-21
运行时间: 45 min
概述: Kikyo learns that the Tatsui gang is responsible for planting the bug in her house. Kokonoe resolves to catch Narikawa before he commits more crimes.
Not Found (集 10)
播出日期: 2020-08-28
运行时间: 45 min
概述: The MIU discovers that Etori was taking orders from a mysterious youth. Suspecting that Kuzumi is the culprit, Shima and his team set out to find him.
Episode 11 (集 11)
播出日期: 2020-09-04
运行时间: 58 min
概述: With Jinba in a coma and the MIU on the verge of falling apart, Shima and Ibuki grow distant and begin to take matters into their own hands.
季
集 11