[DeepL Translation - needs review] Introduction to Volume 1: Solving difficult cases that cause a stir in the world immediately! His name is the famous detective Keiichiro Nagumo! It was more than ten years ago when he was .......
Nagumo is now just a bitter old man. ...... He has been left behind by the times and cannot even use a smartphone, when a young high school girl, Mashiro, comes to him and asks to be his assistant.
(Translator: DeepL)
