Serina has decided to live with her father-in-law Saburo, who lives in the countryside. Her husband is apologetic, but Serina smiles and says, "I'm worried about my father-in-law continuing to live alone, as he's not in good spirits either." On the first day of living together, Serina refuses to have sex because her father-in-law is there, but her husband tells her it's okay. Her moans, which she can't contain, reach Saburo's room...