Miria Takamori lives a peaceful life as a teacher, but outwardly female, she is actually a masked mutant known as Storm Lady, possessing a physique rivaling that of men. Having repeatedly thwarted the destructive schemes of the evil organization Bandeshine, one day she suddenly begins to undergo a bizarre transformation. A fully developed male organ starts growing from her groin, and gradually her body begins to masculinize. The new organ's sensitivity delivers pleasure just like her female genitals, and she finds herself increasingly drawn to distinctly male sexual desires. Despite her confusion, overwhelmed by the intense sensations, she begins masturbating in the gymnasium of her school. Though she believed she was alone, her secret act is photographed by her colleague, Teacher Miyo. Using the photo as leverage, they abduct her and bring her to Bandeshine's hideout, marking the beginning of a new and fateful chapter.