Rio Sakurai, a petite-breasted "A-cup" gravure idol, reveals her hidden allure as an underground beauty. In this debut work, she experiences her forbidden first real sex, her pure, trembling face contorting as her pussy is intensely stimulated. Her aroused slit gushes thick, milky juices, exposing a shameless, uninhibited side never seen before from an idol. Rio admits, "Truth is, I'm sexually frustrated as an idol and really want to have sex." This honest desire adds a new, irresistible charm to her performance.