When a person is born depending on whether it is a boy or a girl certain things happen, when a girl is born there is a 100% chance that she is of a race other than human, such as an oni, fairy, vampire, etc. . . with boys, 98% chance of him being a simple human and 97% of the population is female, it is already rare for a man to be born, even rarer is he to be of another species that is not human, quirks also exist but usually who the possess are also the women, this made the men begin to be placed aside, normally they were only seen as a way to generate powerful daughters
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