You've heard of the brilliant but eccentric investigator Sherlock Holmes. It's likely that you are familiar with Moriarty the Patriot, the most infamous adversary of Sherlock Holmes who received a fantastic anime adaption a few years back. Ron Kamonohashi, a brilliant but quirky investigator with a sinister talent that led to his being barred from practicing detective work, is now the most famous detective in fiction making a comeback to anime.
The protagonist of these kinds of stories is usually an average person, such as John Watson. In this instance, we have Toto, a low-level detective who handles all the cases Division 1 considers to be unworthy of its time-the organization's "trash bin." It has some similarities to Zootopia. I appreciate Toto's perseverance and optimism in the face of all the obstacles on his path.
Ron possesses Ranpo's skill from Bungou Stray Dogs, which allows him to solve a case as soon as he walks into a room and figure out what happened instantly, much like an ideal detective character. In contrast to a perfect detective, Ron possesses a more subtle, ancillary skill. Not to give too much away, but this is what leads to the title: Ron cannot lawfully conduct detective work because of this ability. Since Ron has to keep his detective job a secret, it's a really interesting contrast that raises the stakes and further develops his character. It also presents an opportunity for Toto's growth, since he needs to gain self-assurance before he can acknowledge and accept credit for Ron's labor.
The OP is entertaining and lighthearted despite this interest and the stakes involved with Blue, the institute searching for Ron. The ED is also breathtakingly gorgeous. The OP and ED are still a part of the anime, even though I realize that many viewers don't find them interesting. It therefore sticks out when it highlights particular themes or concepts that could come as a surprise.
All in all, if you liked the Sherlock Holmes stories and are looking for something like, I suggest this anime. Even though Ron's ability is a mystery beyond the Mystery of the Week, the anime manages to maintain humor and lightheartedness throughout. Toto's hilarious responses to Ron's shenanigans are worth seeing on their own.