There was a couple who were having a hard time having children, while living a happy married life without any inconvenience. However, the wife, Satomi, was satisfied just to be able to nurture her love with her husband. However, that smooth sailing life changed completely. One day, her husband proposed to welcome her father-in-law, who lives alone, and live together under the same roof. At that time, Satomi had no idea that the evil desires of her father-in-law would attack her...