The popular mature woman, Natsuko Koyama's bound naked body!! After separating from her husband, Natsuko, who is raising her son Jiro alone, cannot forget her ex-husband's violent sex. She often secretly visited her ex-husband's house, but one day she was found out by Jiro. Seeing his mother so pathetic, Jiro's sadistic heart, inherited from his father, began to stir. He took a rope and slowly bound Natsuko's body...
