Hikaru has been living with her husband's parents for three years. After her mother-in-law passed away, she became concerned about her lonely father-in-law. One morning, she sees him masturbating while calling out her name. Hikaru becomes aroused and excited. From that day on, she can't control the throbbing in her body and begins to pleasure herself. Then, one day, her father-in-law comes home to retrieve something he forgot and sees her masturbating. From there, the two of them become close...