Yuu lives with her husband and her father-in-law, who needs care. Yuu finds caregiving a bother, and continues to treat her father-in-law poorly, which leads to his sudden death. Yuu is overcome with intense regret... However, a few days later, her father-in-law, who was supposed to be dead, blurts out, "Sex... I want to see sex..." And so the forbidden relationship of caregiving between the two begins...