Since her husband became impotent two years ago, Chiaki has been living a frustrating life without sex. One day, Chiaki witnesses her son Keita masturbating in his room. She can't help herself and approaches Keita, saying, "You can't be satisfied with just masturbation, right? Won't you have sex with your mother?" and ends up seducing her son. Keita can't resist the power of his mother, whose eyes light up in front of his young cock, and he makes a mistake. However, Keita is also a man with a considerable "virility" and is not going to let it go easily... Mother and son cannot contain their growing sexual desires and continue to fuck each other until dawn and dusk!!