Kanako Maeda witnessed her son masturbating with her own underwear. Believing this situation couldn't continue, she decided to educate her innocent son about sex. However, the education escalated dramatically, eventually leading to Kanako using her own vagina to deflower her son. Instantly captivated by her son's youthful, vibrant penis, Kanako soon began seeking him out herself, spiraling into incestuous sex with him.