A sex movie of Aika Yamagishi, a saleswoman for a T-back underwear manufacturing company. Her sales are always at the top of the company even though she only sells to men. And her secret is… letting customers “experience” the effectiveness of underwear right at home. Because she sells to men, of course Aika also works as a model. Changing underwear right in front of customers, letting customers see, smell, and touch her round, plump butt. Aika even lets customers fuck her to “test” the sexiness, elasticity, and toughness of her underwear! No man can resist Aika’s charm, the number of loyal customers is increasing day by day…….