Ai has been married for two years and she lives with her parents-in-law. Ai's husband is always focused on work so he is superficial in "that matter" and they have not had a child for two years. Ai sees that her parents-in-law have a very close relationship, they often make love to each other and she becomes jealous of that. She decides to seduce her father-in-law by talking about her troubles, and soon the father-in-law has a craving for his beloved daughter-in-law. From then on, he fucks Ai twice a day and is determined to help his daughter-in-law get pregnant so he can have grandchildren to hold.