Next door to the young man, Kyo, moves a married woman named Yukie Mizukami. Though somewhat plain, she carries herself with a refined elegance and possesses an outstanding figure, making Kyo secretly admire her. Every day, tormented by the sounds of her moans from midday onward, Kyo agonizes as he strains to listen through the walls. One day, Kyo orders an "onahole" for a friend, while Yukie places an order for "sheer lingerie" as part of her personal collection—both via mail order. Due to a delivery error, the packages are accidentally swapped. As a result, Yukie receives Kyo's "onahole," and Kyo receives Yukie's "sheer lingerie." Upon discovering that Yukie's secret hobby is collecting sheer underwear, Kyo stands frozen in shock.