Based on

Movies like The After-Dinner Mysteries (2013)

Kageyama (Sho Sakurai) works as the butler for rich heiress Reiko Hosho (Keiko Kitagawa). Reiko happens to be a novice detective but lacks certain deductive skills needed by detectives. Because of this Reiko relies on Kageyamaa to help her solve cases. Meanwhile, Kageyama isn't afraid to mince words and often calls out Reiko with his sharp tongue!