The second season of Kamonohashi Ron no Kindan Suiri.

This unusual duo brings the hidden truth into the light! Ron Kamonohashi, a private investigator with serious issues, and Totomaru Isshiki, a pure-hearted but dim police detective, team up to solve the most baffling mysteries! A thrilling detective story for a new generation from Akira Amano, creator of "Reborn!" and "Ēldlive"!
 
(Source: MANGA Plus)

Ron Kamonohashi was once regarded as a genius at the top detective training academy. But after a fatal mistake, he was expelled and forbidden to become a detective. Years later, police officer Totomaru Isshiki knocks on Ron’s door seeking help on a serial murder case. He finds Ron, now a messy-haired recluse, who agrees. Together, this mismatched detective team begins solving their first mystery! 
 
(Source: Crunchyroll)

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