Monami, a serious college student, and her boyfriend were both virgins when they started dating, so they couldn't have sex properly, leaving Monami unsatisfied. One day, Mr. Takeshita, an old friend of her father, visited their home, and in a drunken haze, they ended up sleeping together. Monami was completely captivated by the skilled middle-aged man's caresses. From that day on, she developed a body that easily reaches climax only with older men, and her insatiable sexual desire eventually led her to start seducing them herself...