As the company president's secretary, Ryoko maintains a calm and professional demeanor, firmly rejecting advances from both colleagues and the boss. But at night, she transforms completely—changing her makeup and embracing her sensual side, becoming a hungry, submissive woman seeking intense one-night stands. When a coworker discovers her secret, he demands silent, submissive sex to keep quiet. Even during late nights at the office, she secretly fulfills her hidden desires with the president. Once she applies deep red lipstick, she turns into a ravenous, aggressive woman. Witness Ryoko's stunning transformation and the dramatic shift in her sexual appetite!