Due to his wife's hospitalization, the husband's mother-in-law comes from Kagoshima to help with housework. 47-year-old Norika Nishiura, a woman embodying the grace and beauty of Satsuma tradition, stands out with her voluptuous big tits. As the husband lives alone with his attractive stepmother-in-law, he gradually succumbs to her sensual charm. As their bond deepens, he finally begins a secret physical affair with her.