Beautiful girl Mai is offered as collateral for her parents' debt. Her ordeal begins with violation by the butler, followed by strict training under a supervisor, through which she gradually undergoes transformation. Forced to clean with a vibrator inserted in her pussy, sobbing during deep throat sessions, subjected to compulsory spread-leg cunnilingus and fingering, made to cum through relentless blowjob training, and engulfed in humiliating sex—on the path to becoming the perfect maid, the pleasure hidden within her mind and body slowly awakens.