Mai Yahiro dreamed of attending the same university as her mother and dedicated herself to calligraphy in preparation for an arts-based entrance exam. However, after losing her mother, while earnestly considering her future and thinking of her father, her life took a sharp turn when she was approached one day by an unfamiliar old man. Ahead of her lay an unwanted future orchestrated by corrupt adults, and she began walking a new path—learning the pleasure of training, bound and disciplined, as a beautiful schoolgirl in uniform forced to take creampie after creampie.