搾精士のお姉さん ～女性だけの街で精液奴隷にされちゃった僕～

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.