Yui lives with her husband and father-in-law. There was nothing wrong with their life... One day, her husband confessed, "The doctor told me I'm infertile." The wife who wanted a child couldn't hide her shock. After discussing it together, they reached an unconventional conclusion: the mother-in-law and daughter-in-law would have sex to conceive a child. Though confused, the father-in-law began to see his beautiful, well-built daughter-in-law as a woman and became excited, embracing her. However, two friends of the father-in-law who had been watching said, "Let us help with making the baby too" and proposed this to the father-in-law.
