Satoru and his wife both work, making it difficult for them to have children. As a result, Satoru ends up living at his in-laws' house. However, his wife keeps finding excuses not to engage in child-making. Eventually, they get into a fight, leading to days where they can't even have sex. Seeing this, Satoru's mother-in-law, Chisato, becomes worried. One night, Satoru sneaks into Chisato's room and starts touching her. When Chisato wakes up, she is confused but says, 'You must be pent up... I'll take responsibility for my daughter's selfishness.'
