Mafuyu's Notes 1 is a notebook in Fatal Frame.
|Himuro Mansion Investigation
Himuro Mansion was once the home of a large landowner that controlled vast areas of land. They also say that the site held some special significance that had to do with Shinto rituals of the region. (I couldn't find any detailed books about these Shinto rituals, though.)
The last master of the Himuro family line massacred his entire household. Later, another family that tried to live there disappeared.
Maybe that's why there aren't any accounts of the Shinto rituals, and why the exact location of the place isn't recorded anywhere.