In the misty ridges of West Virginia, 16-year-old Aiko grapples with a chilling secret: she is a Nukekubi, a Japanese spirit whose head detaches at night, glowing with unearthly power. Haunted by the Night Skull legend and surrounded by the rusted relics of a coal processing plant, Aiko uncovers a blend of Appalachian folklore and Shinto mysticism that ties her to an ancient force. As black chrysanthemum petals signal danger, she must master her dual heritage to confront a darkness threatening her home.