The Dinner Table Detective (謎解きはディナーのあとで) is a Japanese mystery novel series written by Tokuya Higashigawa and illustrated by Yūsuke Nakamura. Shogakukan have published three volumes from September 2010 to December 2012. A manga adaptation illustrated by Aya Kawase was serialized in Shogakukan's josei manga magazine Petit Comic from April to November 2011, with its chapters collected into two tankōbon volumes. A sequel novel series by the same author and illustrator, titled Shin Nazotoki wa Dinner no Ato de, was published by Shogakukan in two volumes from March 2021 to September 2024.
A 10-episode television drama adaptation aired from October to December 2011 on Fuji TV and its affiliates. An anime television series adaptation produced by Madhouse aired from April to June 2025 on the same television network's Noitamina programming block.
Plot
Reiko Hosho, a wealthy heiress of the Hosho Group, secretly works as a rookie detective for the Kunitachi Police Department under Inspector Kyoichiro Kazamatsuri, who himself is the heir of Kazamatsuri Motors. At home, Reiko wears an elegant dress while she eats dinner. Whenever she seeks advice from her butler Kageyama concerning a difficult case, he questions her inability to solve mysteries before he proceeds to figure it out for her.