So it's not 9/10 it's 9.5/10. 7th episode is so wholesome and warm.. Seems like after 13th episode (first half) anime is going down the fanfic. But still 1st one is really interesting. Okay, I was wrong, it swings from annoying to smth that has potential. The finale brings everything to a logical and satisfying conclusion, but it was like everything was a play of actors with their roles.
The last episode is just awesome! You don't have to watch the whole series (although it's good), but the last arc is a must-see! It is thanks to it that the entire series, all three seasons, add up to an excellent complex story with a score above 9.