――Spring 21XX.
Due to the rampancy of radical feminists, Japan had become a society completely dominated by women. In accordance with the "Gender Segregation Act," established a few decades ago, immediately after birth, boys were sent to concentration camps, and raised as soldiers to deal with an ongoing war. Savage men were eliminated, the world had truly become a society of women, by the women, and for the women, a Utopia of Maidens!
However, in such a world, there was one boy who tried to survive while hiding his gender. Originally a child soldier in the defense forces, because of certain circumstances, he hid himself in a remote village under a fake identity, and lived peacefully with his adoptive mother and sister.
Our story begins when the boy is ordered, under the instruction of a social management AI, the "Mother," to attend the training school of the "Security Force," a women's armed forces.
Along with his sister who decides...
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