I'd give it 9.4 if I could. This is definitely one of the better "detective/investigator" type of anime.
The anime does an amazing job at keeping everything in the story within a boundary of "this could actually be possible in real life. The MC's are chillingly sharp, and keen, and it can be scary sometimes which makes you happy they're "good guys. But the authors do a great job at keeping them human, and vulnerable, and making you want to empathize with what they're going through.
There are some subtle cliches, but it's never over the top. Instead the anime delivers its impact through powerful story & character development, and oh boy is it a ride.
I'm really enjoying this so far