Why does no option in "Save Jack: The Interactive Adventure" successfully save Jack? Nothing can stop the Ginosaji. The Ginosaji will never stop.
Jack starts off completely shaven, and gradually grows a beard during the video. Clearly he became afraid of shaving after the Ginosaji made him cut himself with the razor.
The woman who tells Jack about the Ginosaji looks very bloody and beaten, just like Jack does at the end. She was probably attacked by the Ginosaji as well.
Wouldn't that mean she found a way to get rid of it, or at least keep it at bay for a while?