A videotape arrives from Keita's mother, unveiling his brother's disappearance. Haunted by this memory, Keita ventures to the ruins of a mysterious mountain to confront the incident.

One day, a videotape unexpectedly arrives from his mother. It shows the moment of his brother's disappearance. As unforgettable and ghastly as this memory is, Keita decides to confront the incident once more and retrace the past, heading to the ruins of a mountain that should never have existed.