After taking care of her father-in-law for several years, Chitose has recently started to feel uncomfortable with the way he looks at her. She consults her husband about it, but he brushes her off, saying, "I'm tired..." And when he asks for her body, his dick just doesn't work. In the midst of this stressful life, Chitose gradually begins to Kokoro her father-in-law, who continues to show a strange interest in her body...