Three pristine maids take up employment at the home of an erotic novelist, lured by high hourly wages. Despite their quiet and elegant demeanor, they obediently endure extreme punishments—forced to keep vibrators inserted while being whipped on the buttocks with a belt at their master's command. Maid Kaoru, in particular, has her cute rear swollen to the limit under relentless belt strikes. All maids withstand over 500 OTK spankings, and after their strict discipline, are rewarded by performing blowjobs—a rigorous training regimen for these masochistic new maids. Under the strict guidance of head maid Aoi Sakaki, each maid shares a secret love for spanking, allowing viewers to fully savor their intense pursuit of physical and humiliating limits.