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.

A struggling actress agrees to a fake marriage with a wealthy heir to help him hide his homosexuality, but their plan is threatened when his ambitious younger brother grows suspicious and seeks to expose the truth.