I watched this anime twice, the first time when it premiered many years ago and the other time almost recently. When you see it for the second time you realize the giant plot hole that the anime has because of the theme of time travel, they just didn't raise that part very well and I, who am very thematic with that, honestly I didn't like it, technically half of what happens in the plot like for example saving the brother of the co-protagonist doesn't happen.
What does have its merit is ZHIEND, tremendous soundtrack, I still listen to it today, they have an album that can be found on YouTube, totally enjoyable and with very good songs.
I'm going to have to watch the anime again, I think my innocence at the time made me see it all too pretty hahahaha.
ZHIEND was a 10 in the whole anime.
a hug