Reiko solves nothing. Her butler Kageyama solves everything, then spends dinner systematically dismantling her detective work while she sits there in an evening gown getting roasted by the one person legally required to serve her tea. The show's real mystery isn't whodunit, it's how a woman this incompetent keeps her job, and why watching her fail upward while a butler narrates her incompetence never stops being funny. Every case ends the same way: Reiko confident, Kazamatsuri baffled, Kageyama arriving with the answer and a cutting remark that lands harder than the actual crime solving.

Reiko Hosho leads a split existence: by day, she is a rookie detective fighting crime under Inspector Kazamatsuri, an incompetent boss who also comes from a wealthy family. After work, she trades her pantsuit for a lovely dress to have dinner each evening. The catch is that Reiko struggles to crack the tougher cases on her own. Her saving grace comes in the form of Kageyama, her sharp-tongued butler, to whom she turns when an investigation stalls. Rather than offer gentle guidance, he mocks her poor deduction skills while untangling each case with effortless brilliance. Reiko wants to become a capable detective, and Kageyama's caustic commentary and superior deductions make him both her harshest critic and her best help. The result is a comedic mystery drama built on the friction between a determined heiress and her mocking, brilliant butler.