Natsuko Aiba, a private tutor, has a sexual fetish for wanting to have sex when she hears the sound of a guitar. When Natsuko starts tuning the guitar in the room of her high school student teacher, Takuya Kojima, she warns Takuya, who is distracted by her bare legs sticking out from under his skirt, and then she uses the guitar to rub her thighs against his...