Six months ago, Mizuki lost her husband in a traffic accident and became alone. Concerned about her mother, she was allowed to live with her daughter and son-in-law. Although she felt less lonely thanks to her daughter's family, the woman inside Mizuki couldn't bear the emptiness without her husband. She had developed a habit of masturbating during those times. One day, while pleasuring herself, she was caught by her son-in-law. Surprised but intrigued, he hugged her tightly. Upon hearing that her daughter wasn't happy with their marital relationship, they comforted each other through passionate lovemaking...

半年前、夫を交通事故で亡くし一人になったみづき。心配した娘の提案で、娘夫婦の家に住まわせてもらっていた。娘夫婦のおかげで寂しさは紛れてるものの、夫がいない時間にみづきの中の女は耐えられなかった。良くないと思いつつ自慰をするのが日課になってしまっていた。ある日、自慰を娘婿に見つかってしまう。娘婿は思わずみづきに抱きついた。みづきは驚いて話を聞くと、娘との夫婦関係がうまくいってないと言う。二人はお互いを慰め合うように身体を重ねていった…