Hibiki, a nurse, was concerned about her brother-in-law who had become ill. Hibiki is hurt by the appearance of her brother-in-law who lives in good health and wants to help her. One day, Hibiki learns that his brother-in-law was watching AV. And Hibiki decided to give sex education to her brother-in-law as a sister-in-law and a nurse for her brother-in-law who does not yet know the body of a woman.
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