Aya, the wife of the unremarkable Inoue household, and her son Tetsuro harbor a secret they can never reveal. Bound by blood as mother and son, they are trapped in the forbidden relationship of incest. Though they claim they should part ways, their hearts and bodies remain irresistibly drawn to each other, unable to break free. This taboo affair grows even more intense under the husband's very nose, their desires escalating each day. Once again today, their silent passion erupts into fierce, unrestrained intercourse—far beyond mere silence.