Rina Ishihara's husband decided to go on a business trip abroad for a year so that when he returns, he would be promoted and have a better income. Although Rina did not want this, she had to accept her husband's decision because it was his passion. The story begins when a group of criminals specializes in studying and finding women whose husbands are on long business trips, leaving them alone at home to carry out rapes. How can a weak woman defend herself against that?