Nana, the daughter of a company president, visits a high-end esthetic salon for the first time, recommended by her best friend's fiancé. However, the salon is actually an underground brothel specializing in lewd sex massages. Unaware of the truth, Nana is gradually drawn into its services. As her body and mind slowly open up, she awakens to new pleasures. She rediscovers her own sensuality and dives deeper into intense experiences.