Detectives These Days Are Crazy follows the once-great detective Keiichiro Nagumo, now your average middle-aged dude so behind the times he doesn't even know what a smartphone is. (HOW?) He meets a high school girl named Mashiro who wants to be his assistant, and the duo certainly makes for an exciting pairing.

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https://www.comicsbeat.com/manga-review-detectives-these-days-are-crazy-is-a-manga-that-hits-different-when-youre-no-longer-the-kid/