Eriko, along with pals Yuma and Ayano, tests into an exclusive all-girls high school. Her dream of attending a school full of beautiful, clean, and classy role-model girls is soon shattered, as the reality of an all-girl school sets in. Rumor goes, with an absence boys in the school, an atmosphere of laxness sets in, slowly eroding the girls’ regard for culture and become a creature far scarier than boys.