Rei, a highly capable and beautiful secretary, was once the secret mistress of the former chairman, serving him since his time as company president and enduring prolonged training as his submissive lover. When a new president takes office and appoints Rei as his personal secretary, both the chairman and the new president begin using her as an intermediary to probe each other's weaknesses. As a result, Rei finds herself deeply immersed in intense fantasies even during work, her emotions growing increasingly unstable and turbulent each day.