Sara Price, an American woman, travels to Japan after receiving news that her twin sister, Jess, has gone missing. Jess was last seen entering the Aokigahara Forest, also known as the Suicide Forest, at the base of Mount Fuji, a place known for its dense vegetation and tragic history. Determined to find Jess despite warnings about the forest's reputation, Sara ventures into the woods. She meets Aiden, a journalist who offers to accompany her, and Michi, a park guide who helps tourists navigate the treacherous terrain. As they delve deeper into the forest, Sara experiences unsettling visions and strange occurrences that suggest the presence of malevolent spirits feeding on despair.

Haunted by disturbing hallucinations and increasingly eerie phenomena, Sara's search takes a dark turn as she struggles to separate reality from illusion. Her desperation to find Jess intensifies, pushing her to confront her own psychological demons and the supernatural forces at play. As the line between the living and the dead blurs, Sara faces numerous challenges that test her resolve and question her mental stability. The forest's ominous presence grows stronger with each passing moment, setting the stage for Sara's ultimate confrontation with the unknown.