Every last Thursday of the month at an all-girls high school, the students of Class 2–5 cast their votes in a popularity poll. The results classify them into Grades A, B, C, D, and F. If they fall into Grade F, they become legitimate victims of school violence.
Many years after a sweltering summer that spun out of control, Eva returns to the village she grew up in with an ice block in the back of her car. In the dead of winter, she confronts her past and faces up to her tormentors.