One holiday, her husband took their son away from home to attend a debate recital at the English conversation class his son attends. As Miori hurries off to take a shower and wash her crotch, her sex friend Okazaki arrives. Meeting again for the first time in a long time, the two exchange a passionate kiss without even a moment's hesitation, and before they can even move to the bed, they make love in the entrance hall. From that moment on, a "time-limited fuck" begins between a man and woman with a large age gap, as they release their pent-up sexual desires...