Haruki Sato was assigned to a department called "Sexual Relief Division" at the company where she just got hired—a job with a bizarre duty: female employees are required to relieve male employees' stress and sexual desires. Unable to quit because she needs to send money back to her parents, Haruki is forced to endure days of collecting sticky, exhausted male employees' cum on her breasts, lips, and even inside her pussy. Over time, her body is gradually trained in increasingly depraved ways, transforming her into a full-fledged flesh toilet office lady.