ナマイキ金髪ツインテ爆乳お嬢様をメス豚扱いで孕ませ飼いする性活

The modern era. Having lost their ability to mate and produce offspring, men are useless.
You, the protagonist, attend an academy where a man-hating rich bitch named Ririka rules
supreme the school cast like some kind of Empress and shoves it in your face as a bully.

One day, the government certifies you as a male who still has breeding capabilities and you are given the right to have sex with whoever, whenever and however you please.