Rei Aoki is a married woman who works as a fitness instructor at a gym. She had planned a long-awaited overseas trip with her husband during her rare day off, but her husband showed no interest and decided to go with friends instead. A week later, Rei returned home tanned all over with a golden-brown glow, full of energy. While her husband remains emotionally distant, her students at the gym are captivated by her sensual body. After her trip abroad, Rei's personality and libido have become more liberated. Under the guise of personal training, she boldly seduces her students, aggressively pursuing pleasure and taking control of their desires.