Mako Oda, a married daughter-in-law caring for her father-in-law, has gained a little weight and is advised by him to diet. She casually agrees, saying, "Only if you eat your meals properly, Father-in-law," but her voluptuous, sweat-slicked body drives him into confusion. As he touches her large, heavy breasts and round hips, overwhelmed by desire, he ultimately declares, "Sex is the best way!" and forces her into an incestuous encounter, twisting his aged member into her.