With everything in their lives coming to a standstill, the Tachibana couple decide to take refuge at the husband's parents' house. Mizuki feels guilty about the fact that they have turned up without permission and are causing trouble for her father-in-law, Hanbei. Hanbei takes advantage of Mizuki's pure feelings and gradually reveals his true nature as a perverted old man. Hanbei's stiff penis thrusts into Mizuki's pure and sensitive parts...