A year after losing her husband in an accident, Rina lives alone with her father-in-law. One day, she begins to notice changes in his behavior. He suddenly soils his clothes, calls for her unexpectedly while bathing or using the toilet, and acts childishly, clinging to her for attention. It becomes clear that he is showing signs of dementia. Soon, Rina is assaulted by her father-in-law. Though she initially resists, she cannot bring herself to abandon him and begins taking care of his needs. Over time, something within Rina begins to change. Her feminine desires awaken, and she starts craving his manhood, drawn into a forbidden relationship fueled by caregiving and lust.