Rika marries a successful elite but faces constant pressure from her mother-in-law, Yone. “If your child fails the entrance exam, it will be the fault of a mother who only graduated from vocational school,” Yone warns her. The crushing pressure leaves Rika unable to think about anything but the exam. One day, she answers the door to a salesman with an unsettling smile. He asks whether she is worried about her child and promises that his product can help. Lured in by his soothing words, Rika is gradually subjected to brainwashing and hypnosis...