Without going into spoilers, I can say that the ending was interesting and surprising in a few different ways, though a mystery will always be more interesting that its answer.
Apparently this is the same artist of Your Lie in April? I had only watched the anime for that so I don't know how their art in that manga is, but in general it's strangely bad when it comes to faces? It only happens sometimes though, and I don't really understand how they can sometimes get things right, and sometimes not. They don't seem to have a problem drawing more complicated poses or backgrounds, but a 3/4th view of a face is really hard for them to do. Still, I just ignored that as much as I could (plus I don't particularly like how they shade in the lips of the characters but that's just a personal preference. I think it works better in the Your Lie in April anime where it's not pure black)
