一位中國武術家回到日本，轉學到一所男校。他天生體質特殊，即使平時是“男人”，一旦身體濕潤就會變成女人。只有在被灌滿精液後，子宮被精液填滿，他才能變回原形（男性）。這位英俊的青年變成了美麗的女人，這引起了他性慾旺盛的同學們的好奇！由於他需要性交才能變回男人，他只好勉強滿足她的性要求……這是一部以擁有特殊體質的北野先生為主角的鬧劇！
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