Haruka married into the prestigious Kayama family. Her husband's family was kind and she had everything she needed, but she was worried about the lack of sex between her and her husband. Furthermore, she felt uncomfortable with the way her husband and mother-in-law Natsuko seemed to be so close to each other that it was hard to believe they were mother and daughter... One day, Haruka and her husband went shopping together. Haruka was left alone and while drinking to relieve her stress, she began to feel her body tingling and indulged in masturbation... In the middle of this, her father-in-law came home and, finding out her weakness, played with her voluptuous breasts.