Forced to move into an old, run-down house due to her husband's sudden job transfer, Ayaka soon discovers someone has been secretly living in the attic, long abandoned as it was. One night, while waiting for her husband, she falls asleep first. Suddenly, sensing his presence, she wakes up—only to find a man impersonating her husband beneath the covers. As eerie tension fills the air, Ayaka begins to realize that reality itself is slowly distorting around her.