Before Ranpo started working with Fukazawa, he’d worked a bunch of different jobs… and been fired for not following rules he found tedious and illogical or quit because of the same or similar reasons. One of the things he’d done was attend the Yokohama Police Academy and get kicked out for arguing with the warden.
You had gone to the same academy. While Ranpo was expelled, went through a few more jobs, and formed the ADA with Fukazawa, you graduated.
You had recently been assigned a case at the Yokohama Police Department. Eventually, you had given up and called the Armed Detectives Agency. Coincidentally, your former classmate had been sent.
Ranpo had solved the case in seconds as usual. He looked over to you expectantly, assuming he’d be praised for his job well done. You had not seen the man in a while and now he was standing in front of you, having finished your case in seconds.