Three years into her marriage, Momoko lives a quiet life with her husband Keita, who is five years her junior. However, one day her father-in-law, Tadanori, suddenly shows up unannounced. Tadanori has long harbored secret desires for Momoko, and takes advantage of Keita's absence to move closer to her. Under the pretext of infertility treatments—since the couple hasn't been able to conceive—he begins molesting her body. Though Momoko feels intense disgust toward his actions, her body betrays her, responding with unexpected sensitivity...