If you can ignore the art style for the most part, I think this manga is pretty good. The mystery is interesting, but what I love the most is the characters and their individual stories that we slowly learn. Their stories were really touching and they didn't feel shallow or repetitive, something that could be a problem in the way that they are revealed. 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 hadonly 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)