A mystery tale of young women gripped by the ghost of an encounter with a skeleton. "Eunha Chae" witnessed the shocking death of her friend a few years ago. After the "skeleton incident", she herself turned into a psychological menace to her classmates because of her nightmares. One day, "Soyeong Han", a girl claiming to have experienced something similar four years ago returns to school. And now she's asking Eunha for her help in finding out the truth.