"I'd like some options if possible... just having sex isn't enough." One day, Mirai had sex in a situation where she opened the curtains in her room and thought that someone might be watching her. She was overcome with a thrilling feeling she had never experienced before, and awakened to a sexual fetish called "immoral sex." Since then, she has not been satisfied with the pleasure of pure sex alone, and has enjoyed the thrill of having sex with an affair without being found out, and now she has finally appeared in an adult video... She revels in the greatest pleasure of infidelity, spiced up by the greatest sense of immorality she has ever felt, which she could never get from having sex with her husband!