**SPOILER FREE REVIEW**
4 seasons, 13 episodes of 20 minutes each aproximately (s1, s2, s4) and 5 episodes of 50 each in s3, making a total of almos 18 hours of my life watching this anime ... And this is what I get?
I have to be honest, I really enjoyed the first 2 seasons, I got really hooked up to the series for some reason and I wanted to see the beautiful end that made me feel "It was all worth" but no. What I saw was 13 episodes based on just 1 character, putting aside all the history of previous seasons, putting aside all of the main characters, putting aside everything just for 1 character ... And ending that did not close anything and mean less Than Nothing
Those 13 episodes felt just like the begining of the story but no, that's all folks. They could have done that in just 6 episodes and close the story like this series deserved it. I'm very dissapointed and sad. Please do not watch this last season nor the 3rd one, in my opinion this series should have ended in the 2nd season, when it was still good.