Attracted by the high salary, Reina accepted a special offer to become the president's secretary at a certain company. Her curiosity was piqued by the unknown territory she would not normally experience. However, it led to an unexpected turn of events that betrayed her sweet expectations. What began was a secret training session that was beyond common sense. "Something's wrong..." Reina felt that way, but she tried to accept it as part of her job. However, with each passing day, her mind and body were inevitably changing.