A traffic accident brings together the widow Michiyo and her step daughter Takako with Hideo, the young man who caused the accident. Hideo and Takako start a relationship but Michiyo finds out that Hideo is the son of the man who raped her many years earlier. After this discovery, Michiyo's feelings alternate between guilt and excitement and she secretly spies on the young lovers. As atonement she decides to have her "most sensitive areas" tattooed but the pain brings her pleasure. The denouement has Hideo lusting after Michiyo and raping her as his father had done.