Ever since she was a child, Mio has loved reading and enrolled in a national literature department, and at one point wanted to become a literary researcher. But she is now married to her husband, whom she met in college, and has one son. Her kids are cute, but she's starting to get bored with her mundane stay-at-home mom life. At that time, her son brought her friends and held a study session for her, and Mio was supposed to be the lecturer. While interacting with her young son's friends, her sadistic side is stimulated.
