Bruh, this is one of my favorite mangas i've ever read! I wish it just had another ending and that it was longer.
Story wise, didn't expect it to be some kind of "supernatural" stuff, but it was a really good story, good plot, and overall loved it.
The art was nice as well, nice that you could tell the difference between characters (i've seen a couple where you couldn't tell who was who), and it was a pretty artstyle, and i loved the mask, keeps it mysterious. Also i really liked the quotes between chapters, kind of disturbing as well.
As of characters, i don't feel like there was much depth on the different characters, which is fine, isn't needed too much.
Overall, one of my favorite mangas of right now, i just wish it was longer!