The school's student council was established to ensure students follow the rules. However, this school's student council is composed in an unusual manner, with all members revealing themselves as "S-girls." They do not hesitate to impose strict punishment on anyone who breaks the rules—even if the offender is a teacher. Once again today, the sounds of their merciless discipline against rule-breaking male students echo throughout the school. The strict rules, along with the student council's enforcement, shape the daily life of this school.