Yuka, a serious female college student, was not satisfied with SEX, but something happened that broke Yuka's sense of values ​​regarding sexuality.Her father's friend Akikawa, who had been her tutor when she was little, got drunk with her, and she attacked Yuka, who had grown into an adult body.She was puzzled, but from the middle of the day, she was overwhelmed by the middle-aged man's skillful technique, which she had never felt with her boyfriend.From that day on, she became a super-sensitive constitution that made her lustful just by seeing an old man.