A pure and innocent girlfriend who has never had sex is exploited by the tennis coach, who turns her into a convenient sex toy. (Uruki Sara MKON-112)

I have a girlfriend who's on the same tennis club. One day on my way home, I couldn't resist and forcibly kissed her. She said, "I want a better atmosphere... tomorrow night, Mom and Dad won't be home, then..." However, the tennis coach, Okazaki, recorded the kiss. Okazaki used the video to blackmail her, turning her into a convenient sex slave, slowly "training" her...