Keiko Shiratori, a well-bred young lady, begins working at her grandfather's company for social experience. Sheltered and naive due to her upbringing, she secretly harbors a deeply lustful side and loves masturbating. When a man secretly films her private moments and uses the footage to approach her, a provocative story unfolds. The contrast between her innocent, pure demeanor and her unexpected erotic nature creates an irresistible allure.