Karen, an honorable school girl who is also the student council president, finds out about the existence of the SM club that is secretly operated at school. She is intrigued by her interest and peeks into the SM world, and she realizes that she has an M temperament. Guided by her teacher, she releases her true self, a masochist, through bondage training as her slave, gets stuck in that world, and transforms into a M girl who waits every day for after school to come...
