23-year-old amateur Hoshino Hibiki is a young woman with I-cup breasts. Working as a nursery school teacher, she lives as a struggling working poor woman with an average annual income of 2.5 million yen, surviving by selling her body. She willingly chooses to be dominated, unleashing her masochistic instincts. Normally plain and innocent, the act of being filmed awakens her consciousness as a "woman." Each time she is thrust into by a thick cock, she recalls the faces of her kindergarten children, arousing a sense of taboo excitement. Experiencing the intense clash between guilt and pleasure, she embodies a shocking, unforgettable moment.