三毛猫ホームズの探偵日記

[DeepL Translation - needs review] An orchestra member was murdered at a concert hall. The letter "K" was left at the scene. What is the meaning behind it?　Detective Katayama, his sister Harumi, and their cat Holmes (?) try to solve a difficult case! The story is about Detective Katayama, his sister Harumi, and their cat Holmes, who try to solve a difficult case! From elementary school to high school level.

(Translator: DeepL)