Yuma is a 173cm tall career woman with a slender body and fair-skinned big breasts, and is the Madonna of the company. One day, she is ordered to work late night overtime by her boss, whom she hates. The moment they are alone in the office, he grabs her breasts from behind. She resists, but he relentlessly squeezes them and she gives in. From that day on, she becomes obedient to his persistent breast harassment, and she becomes addicted to his breast orgasm training.