Aika is a salesperson for a company that manufactures T-back underwear. Her sales are always at the top of the company even though she only specializes in selling to men. And her secret is... for customers to "experience" the effectiveness of underwear at home. Because it is sold to men, of course Aika is also a model. Changing underwear right in front of customers, letting customers see, smell, and touch her round, plump buttocks. Aika even let guests fuck her to "try" the charm, elasticity, and toughness of her panties! No man can resist Aika's charm, the number of loyal customers is increasing, and sales are also increasing rapidly...