Koki, a bespectacled, unsophisticated part-time worker, always looked down on the sexually harassing manager at her workplace. One day, a sign appeared in the changing room that read, "No wearing sweaty underwear for a day while serving customers!" The earnest Koki reluctantly complied with the manager's rule against sexual harassment, but ended up sinking deeper and deeper... Being photographed upside down without underwear or a bra, being licked naked in front of the cashier, having sputum sprayed on her face from her glasses, wearing cheap, shameful work clothes—the J-cup busty part-time worker gradually became addicted to perverse sexual fetishes...