[Riona Ryukawa Lesbian Debut] Rio, a university student, applied for a part-time job as an underwear monitor for women only. On the day, under the instructions of Tsubasa, an employee of the manufacturer, she will wear the most luxurious and obscene lingerie she has ever seen. She is exposed to the gazes of others in her risqué underwear, and her private parts are played with in a sexually harassing manner under the guise of a comfort test, but she endures it because it is a high-paying part-time job. However, Tsubasa's obscene touches, her sense of shame and impatience stimulate all of her nerves, and her body gradually becomes hotter and more sensitive...