Office lady Miya, burdened by her fiancé's gambling debts, begins working at night to repay them. Lured by an exceptionally high hourly wage, she joins an SM club and comes under the strict discipline of an obsessive manager. She undergoes intense training involving nipple suction, piston vibrator sessions, female dog training, parading around on a leash, horsewhip punishment, anilingus service, thorough blowjob instruction, anal finger stretching, anal vibrator insertion, and humiliating enemas using an oversized anal douche. Initially pained by the treatment, she gradually awakens to her true masochistic nature, becoming immersed in pleasure. Enduring relentless anal intercourse and intense whipping from lustful clients, she continuously surpasses her own limits, descending deeper into submission.