After twenty years of marriage, Sayuri's son Keita has come of age and Sayuri is relieved that she has fulfilled her role as a mother. However, Sayuri's peaceful daily life is soon to be shattered by a certain incident. One day, Sayuri is raped by Kobayashi, a part-time newspaper delivery man with whom she was supposed to be close, without knowing why. Just as the wounds in Kokoro healed, the stimulation of Kobayashi's penis engraved on her body transformed Sayuri from a "mother" into a "woman"...