Mayura is a young lady who, since childhood, has spent every weekend at the riding club with her father, enjoying time on her beloved horse. One day, she accidentally saw a horse's erect penis up close and whispered in a trembling voice, "S-so incredible..." Unbeknownst to her, a man had been quietly watching over her since she was a little girl. He was a stablehand working at the riding club, deeply fond of Mayura, yet unable to confess his feelings due to their differing social status. As the years passed, Mayura's slender body matured into a sensual beauty, her white riding pants so tight that her underwear beneath became nearly transparent. The way she rode her horse evoked an unmistakably seductive image—reminiscent of the cowgirl position.