Yurika lost her husband a year ago. Seeing her daughter feeling lonely, she agreed to live together with her daughter and son-in-law. The son-in-law was kind and secretly harbored feelings for Yurika. One day, the daughter came home drunk. Yurika and her son-in-law went to greet her at the entrance and helped her inside. Playfully, the daughter groped Yurika's breasts, which aroused the son-in-law. After putting their daughter to bed, Yurika was cleaning the living room when the aroused son-in-law suddenly attacked her. Though she resists at first, the intense pleasure—long absent from her life—overwhelms her, and she involuntarily surrenders. From that day on, their relationship grows tense, and an illicit desire begins to bloom between them…