[Rio Rukawa Lesbian Debut] College student Rio applies for a women-only lingerie modeling part-time job hosted by company employee Tsubasa. On the day, she is made to wear extravagant and extremely revealing lingerie unlike anything she's ever seen before. Following the manufacturer's instructions, she endures the embarrassment of exposing her underwear-clad body to strangers. Under the guise of comfort testing, she is subjected to acts bordering on sexual harassment, with her genitals being touched and teased. Despite the high-paying nature of the job, Rio is forced to endure it all. However, Tsubasa's lewd touches, combined with Rio's growing humiliation and anxiety, gradually heat her body and heighten her sensitivity. The experience becomes more than just a simple job—it evolves into something deeply intimate and transformative.