Several students are discovered to have been mysteriously drained of their youth. They retain youthful, albeit slightly wizened bodies, but have the chemical composition and actions of octogenarians. The girls investigate and come across the principal's diary which he has kept since the 13th century, thus learning that the school's principal is in fact a centenarian. He has maintained his youthful physique by absorbing the youth of his juvenile fellows to keep himself immortal.