This was good, but there was a few parts that I just didn't understand. I won't spoil it because it just might be from my own misunderstandings, so I will just reread what I didn't get. Maybe.
Its a good story, a little supernatural, a little suspenseful, a little romance, just had a whole bunch of elements that anyone can enjoy. Overall, straightforward story; nice, clean art style; some characters were really good, like Shouko (aka best girl, fite meh), and some were just badly written.
I think a 7/10 is what I will rate it, not a masterpiece but worth reading at least once. Maybe you might like this more than I did, so give it a read.