Well I'm going to talk about this anime that probably most will hate because of the ending, but I came here to disagree on the subject. Yes, the ending was disappointing for the simple fact that the hype have greatly increased with the episodes where we hit mostly with plot twists but it was not horrible actually it was good and managed to fit a hook into a new season that will probably be released for being a long-needed anime to finish by having your screen time decreased.
I'll explain why the ending was good:
"He did not appeal to cliches and it was unexpected.
- Completed the problems presented in time limit.
- the hatred of the brother is not forced, because his hatred is only created by the indignation of having lost his mother without doing anything to change it and his means of unloading his feelings is to put the blame on him. In the last episode, it is perceived that he is accepting his brother and diminishing his hatred where he lets his brother go singing, while he acts like that because he feels indignant for the brother to have "left the mother" to live of the music and to be giving up the music because of the mother In my opinion how your brother acts is real if we think of his position (this does not change the fact of being an asshole).
-Get a good hook to have another season to develop the story even more.
About the fact that I must agree, is the repetition of the songs, lack of charisma and empathy in several characters and not have satisfied the great hype that the public created, but the anime still has qualities and was very pleasant and interesting to watch, so I think my anime note is right.
Summing up the final did not manage to conclude the hype, but managed to complete the proposal and history present, besides the fact that they can fit a good hook in 13 MINUTES !!