I would guess that the creepy and horrible ghosts probably have some basis in Japanese folklore, but you don't really need that to enjoy the stories. They're actually pretty funny, although there are scary and tragic moments too.
This is a story I'd really to read more of if it was text or a western-style graphic novel, but I still just don't like the manga style. Too many close-ups of talking heads and not enough background and settings keeps distracting and annoying me.
Borrowed from the library