Hazuki was anxious about her new stepfather, yet she had no choice but to support her mother's remarriage for the sake of their livelihood. However, the reason he decided to remarry was actually centered on her—his own stepdaughter. Her innocent, pale body became the target of his desire. Once again today, her new father imposes "sex education" on the shy Hazuki. Her pure heart and flawless skin are gradually being tainted.