The brother-in-law is the opposite of his husband, a playboy type. Nanae has never liked him much, but she also wants to have a child, so she reluctantly accepts her husband's request. Although having sex with her brother-in-law is not her will, there are days when she can hold onto some hope that she might get pregnant. However, as they continue to be intimate, the brother-in-law becomes more and more familiar with Nanae. Even when she asks for restrained contact, he uses excuses like 'because my brother asked me' or 'for making a baby' and keeps pursuing Nanae's body...
