After being suspended by his team following an outdoor sex scandal with a hostess, professional baseball player Yoshio returns to the countryside to avoid the prying eyes of others, where he meets Miki. Heartbroken Yoshio is transfixed by her I-cup breasts, and Miki is curious about the sexual desires of athletes. It doesn't take long for the two to grow closer. With nothing to do in the countryside, the two indulge in sweaty midsummer sex, with her boobs bouncing wildly. Over and over again, until the end of summer...