After his wife died three months ago, her father-in-law sank into drinking and gambling. Hikaru's compassionate husband invited him to live with them, then kept overlooking his increasingly outrageous behavior out of sympathy for his grieving father. Trapped in a sexless marriage, Hikaru masturbates every day—unaware that her father-in-law has been watching. One day, he uses that secret against her and forces himself on her.