Reina, a part-time worker, was working desperately at multiple part-time jobs to earn money for her beloved boyfriend's tuition, but due to fatigue, she repeatedly made mistakes at work and was told that she would be fired. However, she desperately needs to earn money, so when she pleads with her store manager, she is forced to perform sex work during the late-night shift. Reina tearfully accepted the unreasonable request, but it also aroused the lust of her senior clerk, who relentlessly trained her to use her huge breasts...