A perverted father-in-law who has retired and has a lot of free time sexually harasses his wife who lives with him. The father-in-law, unable to bear the sight of his son and his wife not being able to have children, approaches Yui and asks, "Would you like me to help you have a baby?"Yui is confused by her father-in-law's sexual desire, but she is not satisfied with her husband's sex either... One day, Yui is caught masturbating by her father-in-law, and although she is humiliated, she is made to climax many times by her father-in-law's nasty sex.