One year after her husband's death, Miyako is invited by her daughter and son-in-law to live with them. Her son-in-law, who has been through a divorce and is struggling under the burden of child support payments, works hard to make ends meet. One day, he returns home early from work and accidentally catches Miyako masturbating with a vegetable. Overcome with arousal, he impulsively approaches her, saying, "You like this, don't you, Mother-in-law?" and forcefully initiates sex. After that incident, he increasingly seeks out Miyako's body behind his wife's back. Each time he touches her, Miyako's body betrays her will, responding uncontrollably and leaving her unable to resist. Entangled emotions give rise to a forbidden new relationship between them.