The Adventures of Sherlock Holmes's Great-Granddaughter

(from ebookjapan):

Miruku Katsuragi, an energetic high school girl with a 7th dan in kendo, ends up taking the place of the company president's daughter.

Miruku stays at a mountain villa for a week to receive special training for the daughter, but things don't go well...

In addition, "Dynamite Milk Pie," "My Mei Tachi" and "The Adventures of Sherlock Holmes' Great-grandson" are also included in this volume.