The Haruna family is living happily, alongside the husband’s father. However, as Hana is unable to get pregnant she discusses the matter with the Father-in-law.
After some deliberation, they conclude that the husband is only shooting blanks and she could use extra sperm, like from the Father. They proceed to do it in a respectful way at first. But sure enough, the Father gets hooked to all this sudden creampie action and he can’t stop anymore.