Maid Natsumi has repeatedly failed in her duties, eventually causing her master to lose his temper. As punishment, she is forced into dominatrix play, but due to her lack of readiness as a submissive, she is fired. Later, she enrolls in a maid training facility to learn true servitude, undergoing intense training including inserting dildos and performing full-service sexual acts. She then returns to her master, devotedly offering her F-cup body and striving to meet his expectations without fear of new challenges.