Isabelle Adjani plays Sonia Bergerac, a teacher at a tough junior high. Despite the principal's warnings, she wears a skirt to work. She simply wants to teach her class but the insults are just too much. Scared and taking antidepressants, Sonia finds a gun in a bag belonging to one of her students. She takes her class hostage, so she can finally teach a proper lesson on Moliere.
Skirt Day marks Isabelle Adjani's fifth CÚsar award-winning performance for Best Actress.