Mio, who loved reading since childhood, went on to study at a national faculty of literature and once aspired to be a literary scholar. However, now she is married to her husband, whom she met at university, and has been blessed with a son. Although her child is adorable, she begins to feel bored with her ordinary life as a full-time housewife. It is during this time that her son decides to bring friends over for a study group, and Mio is appointed as the instructor. As she interacts with her son's youthful friends, her sadistic tendencies are stimulated...