A mother who took the place of her son

It's been 10 years since I lost my husband. Sayoko's only son, Hiroyuki, who she had raised by herself, has been hired at her uncle's company, and her mother, Sayoko, has finished raising her children. However, the peaceful days were short-lived when Hiroyuki made a serious mistake at work. Sayoko's uncle, Yoshio, visits her house and approaches her, but there is nothing that Sayoko can do as she is naive. Yoshio, who was secretly targeting Sayoko, begins to grope her voluptuous breasts, saying, ``A mother has to wipe the rug out from her son's failures.''