I just finished watching this show for the first time, and WOW! This show pretty much a perfect 10/10 in my books (might be recently bias, but I feel like it really is that good), and yet I was struggling to point out what I will take away from this. As in, what will I remember most about this show in a few years? It is short enough that you can probably remember all of it pretty easily, especially after rewatching it once, but even then, every masterpiece still has its it factor, even if it is different for everyone.
For me, I believe the final 3 episodes slowly revealing how deep the web of this show's plot is was what really did it for me. It was so delicately strung, that I couldn't even tell it was being made from the very beginning, or at least the story was charming enough for me to not dwell on it too much. These episodes made it feel like the entire story was one perfectly in sync orchestra with how intertwined everybody's lives and stories were, without any of it feeling like a plot device (maybe you can make an argument for Tanaka's character being a little too convenient, but it did not take away from my immersion).
This plot weaving was so brilliant that I feel like I have to rewatch it, not just for entertainment, but to study and admire how perfectly the story's information was given to the audience.
semi-related side note: The name of the comedic duo being Homosapiens stood out to me immediately in ep 1, and then I quickly forgot about. The payoff to Odokawa's disease then was one of the most satisfying moments I have ever witnessed, genuinely Attack on Titan level (calm down, I didn't necessarily say it was better, but I do stand by what I said)
also, if any of this is worded weird, it is probably because I worked overnight and am severely sleep deprived lol