Since getting married, Yuko has been living with her husband and father-in-law under the same roof. However, her father-in-law constantly scrutinizes her every move. He criticizes the food she cooks, and accuses her of being lazy for spending all day on the computer and phone. In reality, Yuko is learning to invest in Forex, wanting to use her free time to learn how to make money to help her husband. Her father-in-law doesn't see it that way, warning her that one day she will 'hold a rock to her own foot'. And indeed, the money she invested quickly lost its value. If she does nothing, she will lose everything. Yuko takes a gamble and uses all of her husband's savings to pour into Forex, only to end up losing all the money. Her father-in-law witnesses it all. Since that day, Yuko has been feeling anxious, insecure, and afraid that her husband will find out she lost all the hard-earned money. At that moment, her father-in-law approaches her and offers to lend her money with one condition... She must satisfy his sexual desires, offering her body to him until she can repay the money! Initially, Yuko refuses, but out of fear of her husband finding out and divorcing her, she reluctantly agrees to her father-in-law's demands...