Sena is trying her best to get closer to her new stepfather. Suppressing her complicated emotions for the sake of stability, she resolves to support her mother's remarriage—yet behind this decision lies an unexpected motive. The reason her new stepfather agreed to marry her mother was his attraction to Sena's innocent and pure appearance. But his true intentions go beyond mere affection; he's driven by a desire for her youth and naivety. Once again today, he forces "sex education" upon the shy girl. Sena's face, once filled with faint hope upon arriving at this household, gradually twists into one of despair.