Story : 9,5/10 The plot is well explained and the story goes very well. Some people may find some scenes are long sometimes, but imo it's part of the atmosphere, and I really like it. The end is what I expected to be tbh, but it's good like that. I didn't expected a happy end at all. I cried like a little asshole. Right in da feels.
Art : 10/10 The sutdio did an awesome work. The art, the colors, the drawings, they are all beautiful, outstanding. Chara design is awesome too. I really love the eyes.
Sound : 10/10 Classical music + awesome background music ? Okay. GREAT.
Characters : 9/10 Really loved the main characters, and none of the minor/secondary characters are here for just one episode, one mission or something (Sword Art Online didn't understood this). All the feelings are well explained, and I really love their voices.
Enjoyment : 10/10 Had a beautiful time.
Overall : 10/10 You like music ? You like beautiful things ? You like to cry like a little c*nt ? WATCH IT. You'll remember this for very, very long.
