Ruka lost her husband and began living with her daughter and son-in-law. Her daughter had always been stubborn, and both Ruka and her son-in-law struggled with how to handle her. One night while drinking, the daughter got upset over a trivial matter. When Ruka took care of her son-in-law, who was drunk and had been drinking alone, he mistook Ruka for his wife, pulled her close, and they had sex. Since then, awkwardness lingered between them. Carrying unforgettable feelings, Ruka comforted herself alone. Then one day, her son-in-law accidentally caught Ruka masturbating and, unable to contain his emotions, confessed and embraced her.