This is a really under-rated manga. It's by the same woman who does Petshop of Horrors, and the art style is very similar, but the story is completely different.
The main character seems to be your usual "boy with special powers" character, but it's actually quite a bit more complicated than that.
Basically, the same excellent writing from Petshop of Horrors is now actually telling a coherent, linear story, which is quite original and interesting.
The only downside is the artwork, which although excellent, is just not QUITE amazing enough to carry a story like this. It was fine in petshop, where everything was a
bit otherworldly anyway, but somehow it just doesn't quite work as well here.
Still, this is just a small downside.
I'd recommend Genju no Seiza to enjoy who enjoys supernatural manga.