is a Japanese mystery novel series written by Tokuya Higashigawa and illustrated by Yà «suke 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 tankà Âbon 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.
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.
A stage play adaptation ran at The Galaxy Theatre in Tokyo from August 31 to September 9, 2012. It starred Daigo as Kageyama, Maki Nishiyama as Reiko, and Eiji Wentz as Kazamatsuri.
A musical adaptation was announced in June 2025, which ran at the Nippon Seinenkan in Tokyo from September 9 to September 23, 2025, and at the Sky Theater MBS in Osaka from September 27 to October 1 of the same year. It starred Tatsuya Ueda as Kageyama, Shiori Tamai as Reiko, and Ryosuke Hashimoto as Kazamatsuri.
An anime television series adaptation was announced on November 25, 2024. It was produced by Madhouse and directed by Mitsuyuki Masuhara, with series composition by Mariko Kunisawa (with Masuhara co-writing Episodes 5B and 6), original character designs by Oreco Tachibana, animation character designs by Izumi Kawada and music composed by Takeshi Hama. The series aired from April 4 to June 20, 2025, on the Noitamina programming block on all FNS affiliates, including Fuji TV. The opening theme song is "Montage", composed by Hiroyuki Sawano and performed by Kento Nakajima, while the ending theme song is "Rhapsody", performed by Billy Boo. Amazon Prime Video is streaming the series worldwide.