Yuri lived with her disabled husband who protected herself and her brother and sister. While she is tormented by a sense of guilt, Yuri's body begins to ache. One day, when she is attacked by her older brother, Yusuke, she indulges in masturbation, and ascends to her sex for the first time in a while. Yuri, who was known for her lewd sexuality, turned into a sex toy of her brothers and sisters.
