In place of her mother's new, sinister and lewd stepfather, Kokona finds solace only in her real grandfather. Her daily life is sustained by the time she spends at his house. The pure, fleeting sexual longing of adolescence slowly begins to manifest within her during these visits. Though his hands sometimes feel rough, even violent, due to his age, they remain Kokona's sole source of comfort. But one day, she experiences adult pleasure for the first time. From that moment on, Kokona undergoes a profound transformation into a new being…