Nanami has never really liked her brother-in-law, who is a playboy in contrast to her husband, but she also wants to have a child, so she reluctantly accepts her husband's request. Although she doesn't want to have sex with her brother-in-law, she has some hope that she might become pregnant. However, as they continue to have sex, her brother-in-law becomes more and more familiar with Nanami. Even when she asks for moderate contact, he makes excuses like "my brother asked me to" and "it's for the sake of having a child" and continues to demand her body...