Monami, a serious and pure female college student, had been struggling with unsatisfying sex ever since she started dating her boyfriend, leaving her unfulfilled both physically and emotionally. One day, her father's longtime friend, Mr. Takushita, visits their home. Carried away by drunken impulses, they end up having sex. Overwhelmed by the older man's skilled and experienced touch, Monami is completely captivated, body and mind. After that encounter, she finds herself easily reaching orgasm—but only with older men. Her libido spirals out of control, and before long, she begins actively seducing them herself.