CHA Ju ran (PARK Bo young), who has always been weak since she was little, is forced by her stepmother to transfer to a boarding school. At an isolated and unfamiliar place, Ju ran goes through a hard time adjusting and her classmates avoid her without telling her why. HONG Yeon deok (PARK So dam) and the headmistress (UHM Ji won) are the only ones who approach Ju ran. As Ju ran becomes close with Yeon deok, she dreams about going with Yeon deok to study in Tokyo, something available only to students with good grades. Then one day, her classmates begin to disappear one by one without a trace after showing strange signs. Ju ran sees the disappeared girls, but no one believes her and the headmistress only focuses on selecting outstanding students as if nothing has happened. Ju ran starts to have doubts about the accidents at school, but soon enough Ju ran starts to notice abnormal changes to her body...