Even past the age of seventy, Makoto's libido remains strong, and he can't help but feel drawn to his daughter-in-law Hana, who lives with him. A former university professor, he passionately quotes Western literature to extol the wonders of sex, but Hana shyly lowers her head without responding. One day, Makoto detects a hidden sexual desire within Hana and decides to take on the challenge of awakening her.