Yuki, having been laid off and now job hunting, ended up staying at his brother Kashi's place. There was a beautiful sister-in-law, Kazumi, who seemed mismatched with the arrogant Kashi, and Yuki wondered why she had married him. Kazumi had never been with any man other than Kashi and was pure, so her sex life with the arrogant Kashi couldn't have been going well, leaving her lacking in confidence. It was a shame for someone with such a beautiful body and so much charm. Thinking this, Yuki decided to teach Kazumi the pleasures of sex instead of his brother…
