Riri is a pure and earnest nurse who has led a quiet life, with little interest in sexual matters, to the point that she sometimes gets touched by patients while at work, but refrains from doing so because it would have a negative impact on the health of other patients. But one night, she is molested by a patient in the hospital. Despite her indifference to sex, she is suddenly turned on by the molestation. She wants to be molested again, to be made to feel even more, and her desire grows. The pleasure of being touched in secret increases, and the tension of not being able to make a sound even when she does feel it. Before she knew it, this immoral act had transformed Riri into a dirty nurse, waiting for the molestation in the hospital every day.