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Amano, who returned to the city where he lived as a child for the first time in ten years, met Yukio Sawatari, a childhood friend, on the first day of his transfer. To his surprise, Yukio, who had been male, had now turned into a female. While sharing in her joy, Amano couldn't hide his embarrassment at this sudden transformation. Yukio, like 100,000 others, had been affected by an illness that caused her to suddenly become a girl.