Corset ni Tsubasa

Chris is a tomboy whose relatives send her away to a boarding school after her father dies. The school is divided into three classes - an upper, lower, and special class. As fate would have it, Chris is sorted into the lower class and given a dusty old room in the attic. In fact, all of the students are oppressed by the cruel headmistress, Ms. Desdemona, and no one can stop it but the students themselves.