First, I dont know why a lot of people are giving this anime 3/10 or 4/10.
The anime is least called amazing and very fun to watch, the plot caught me from the first episode and kelt me interested into it until last episode.
Voices: I found all voices great and fitting to their characters, especially Satoru.
Art: The drawing aren't really the best out there however, they are definitely enough for the anime and satisfying for me.
Story: What could I say ? The plot is the reason i watched the show, usually i wait until he anime has finished airing before watching but this one caught me.
Characters: well, cant give this a 10/10, expected more things from some side characters but Satoru nearly done everything himself except for last 2 episodes.
Overall, 9/10 anime, recommended it to all my friends.