The world is a place of oppression. The year is 2038 and females have evolved into beings of superiority through unknown means. Males have received some evolution of their own, however that is only in the form of serving as food and energy for their now superior female counterparts.
Now a matriarchal paradise, those who control the hospitals have been placing chemicals in the bloodstreams of infant girls at birth to ensure their predatory instincts are unleashed during puberty, with males becoming fair game once their seed is available to be harvested for reproduction. Breast milk also now provides baby girls with their predatory instincts, so mothers most commonly flaunt their female selves by breastfeeding their daughters from as early as possible.