Mattaku Saikin no Tantei to Kitara
Detectives These Days Are Crazy!

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Both mangas have similar, and very ridiculous, sense of humour. Each one of them has also a theme going on, GBs being scuba diving and Mattakus being a mystery, that are mainly there as a set up for a joke than for an actual story. 

Mattaku Saikin no Tantei to Kitara is a detective parady that has dabbled in some Detective Conan-like mysteries. I can't help thinking of Nagumo Keiichirou as sort of an old and bitter alternate universe version of adult Shinichi if he had never become Conan but also if things went very downhill for him after high school.