Shiori, who had just become an esthetician, was invited by her senior colleague Jun to a 3-night, 4-day training session for newcomers. At a training facility far from civilization, Shiori was expected to grow as an esthetician with the guidance of her kind senior colleague... However, what awaited her there was lesbian training from Jun, who was after Shiori's G-cup breasts. "To become a top-class esthetician, you have to understand both the mind and the body of a woman." From that day on, Jun's amazing lesbian techniques were drilled into her body without stopping, and gradually changes began to occur in Shiori's body...