Intrigued by a rumor about a research institute at the foot of Mount Fuji studying the afterlife, Shiu invites the protagonist Haryu Ryoushi to explore the depths of Aokigahara. What was supposed to be a simple vlog shoot shifts the moment they step into the forest. As night falls and the mist thickens, they lose their sense of direction. Shiu vanishes, and Ryoushi is pulled into another reality — awakening inside a strange psychiatric hospital where everyone mutters things that border on madness. As the boundary between truth and illusion collapses, Ryoushi is entangled in a baffling murder case.