A pure-looking girl in a school uniform, with fair skin, walks home after school. She seems to have studied hard and put effort into her physical activities today, as usual. Her innocent, sparkling eyes catch the attention of someone secretly following her—a stalker. However, this man is actually the girl's private tutor. Though he normally appears to be giving her regular lessons, his true intentions are far more sinister. What begins as seemingly innocent tutoring soon turns into a despicable act driven by his own selfish desires.