The first part of the story takes place in the late 19th and early 20th century. On the night of 2. to 3. october 1821 3 girls by the names of Eria, Aylin and Shi got lost in the Aokigahara forest after a party and didn't return home that night. It is also said that the forest's lake named Nyos is haunted and that evry person that comes near it will die a really painful death. It's been 70 years since then but poeple still wonder: what happened to them?