昨年夫を亡くした訪問介護士。寂しさと欲求不満を抱えていたところ、担当する親子に付け込まれ、介護の仕事の範疇を超えたエロいことを要求される。旦那との死別により満たされない心と体を持て余しているのを、逆手に取られ、徐々に支配されていく介護士。そしてエスカレートする親子の性行為は日々サディスティックになり、より激しく進化。そして過激な行為をされるほど、快感が増す未亡人の熟れた体。互いに足りない部分を補填するかのように爛れた肉体関係の泥沼へ…。そして最終的な奇妙な同居生活に…。

A home care worker who lost her husband last year. Feeling lonely and frustrated, she is taken advantage of by a mother and son she is caring for, who demand sexual acts that go beyond the scope of her caregiving job. Her unfulfilled heart and body, left unsatisfied by her husband's death, are exploited, and she is gradually dominated. The sexual acts between the mother and son escalate, becoming increasingly sadistic and intense each day. The more extreme the acts, the greater the pleasure her mature widow body experiences. They are drawn into a depraved physical relationship, as if filling each other's voids… and ultimately, a strange cohabitation…