Newly hired office lady Toda Makoto suffers under her boss, the president's nephew, a demonic figure who casually commits power harassment, emotional abuse, and sexual harassment. But one day, when Toda finally snaps and yells at him, she accidentally discovers his hidden male masochism. In that instant, her boss realizes she has been deliberately tormenting him all along. From then on, his dominant nature emerges, and as night falls, Toda becomes the one subjected to training. By night, their dangerous relationship inverts the hierarchy of the office, unfolding into intense domination and submission.