Sakuseishi no Oneesan ~Josei Dake no Machi de Seieki Dorei ni Sarechatta Boku~

The protagonist is a serious, well-rounded student who enjoys a typical school life, participating in clubs and student council. One day, he is unexpectedly taken to a "women-only city." This city is for women, by women, and only women live there. The women's goal is to have excellent offspring, and the protagonist becomes involved in this process. His new life begins, where he encounters sadistic women who call themselves "extractors" and engage him in intimate situations.