After her husband's death, Chisato moved in with her son and his wife following the third anniversary of his passing. Initially, she and her daughter-in-law were tense around each other, but they seemed to have built a good relationship and were living harmoniously. However, Chisato felt lonely without her husband and would soothe her aching body through masturbation as part of her daily routine. One late night, while she was comforting her aching body, her son caught her in the act. Just as she reached climax through self-pleasure, her son appeared and forcibly inserted his erect penis into her body. Despite being coerced, Chisato found herself complying with her son's demands for sex, and eventually began to initiate it herself. It was then that Chisato noticed something unusual about her body. Her period had stopped. Feeling that she was no longer a woman in the true sense, she told her son about this and tried to end their relationship...
