Runa, 19, a Ke'ai at a certain university in Tokyo, has started a part-time job where she can have sex with older men and have fun. Until now, she had only experienced reckless sex, but now she is fascinated by the intense sex of adults. She has sex with an older man who is about the same age as her father, and accepts his raw penis without a condom, and then he ejaculates his thick semen into her vagina... This is a story about the common sexual situations between a female college student and an older man these days.