Mio disliked her new stepfather. For the sake of stability, she suppressed her complicated feelings and decided to support her mother's remarriage—yet the real reason her new stepfather pursued the marriage was Mio herself, captivated by her fragile, delicate body. Once again today, he administers "sex education" to the shy Mio, a scene witnessed by her stepbrother. Behind this act lies a tangled web of human relationships and familial bonds. The drama unfolds as Mio grapples with inner anxiety, emotional conflict, and the evolving dynamics with her new family.