Sara and her identical twin sister Jess sense when something happens to the other. After Sara has a bad feeling, she is told that Jess entered Aokigahara Forest near Mount Fuji, Japan. Some people believe the forest is inhabited by the lost souls that took their own lives in it. Some believe it's a place where demons live. Others merely think that the forest causes paranoia. When Sara gains permission to enter the woods, she's given one warning: Stay on the path. Yet, when she finds her sister's tent, she ignores the warning and soon discovers the forest's many horrors.