I've just read all the available chapters of this manga, and I must say I find it unbelievably good.
Other characters get introduced a few chapters in, but these two are really the ones to watch. At first, there doesn't seem to be a very strong plot, however it is enjoyable to read. Later on, more than 1 chapter arcs are introduced, and they start to create the bigger picture. It becomes a lot more in depth and demands a little more attention be paid.
I really recommend this for people who like humor, school life, very slightly ecchi, a bit of horror, and although it is about her being a ghost, its not a very typical supernatural kind of feel to it. Usually, I don't read supernatural because it's just seems a bit too far fetched, but this is really good.
I also love the character designs, I mean come on, she DOES look like Yomi from Ga Rei, does she not? And who doesn't love a Yomi look a like?