Even at the age of seventy, Seiji, whose sexual desire has not waned, finds himself sexually attracted to his granddaughter-in-law, Hana, who lives with him. A former university professor, Seiji passionately argues that sex is a wonderful act, quoting from Western literature, but Hana only looks embarrassed and bows her head. One day, by a mere chance, Seiji discovers Hana's secret sexual impulses and sets a trap for her... Note: The recording content may vary depending on the distribution method.