Do you know of a story where a bunch of people…

Do you know of a story where a bunch of people go up a mountain that has people shaped holes in it, and one of the people has a weird dream then finds a hole that he fits perfectly into. But before he goes down the hole he goes to the other side of the mountain to see if the holes come out anywhere and sees a girl who went missing a few days earlier coming out of one of the holes with her body all twisted and warped. Probably not a great description, but I've been looking for this story for ages

An absolute beast of a manga – http://brasscockroach.com/h4ll0w33n2007/manga/Amigara-Full/Amigara.html