https://www.dlsite.com/maniax/work/=/product_id/RJ01481895.html

The time is the near future.
Due to the effects of a pandemic, the world’s male population has drastically decreased. With birth rates plummeting and the continued threat of human extinction, there is much clamor about the crisis—
Around this time, you move to Kawashima (交島), a single-town island floating in the southern seas off Seisui Prefecture, where your grandfather has an empty house. It is an isolated and desolate countryside town, but it is home to an academy designated by the country as an educational leader.
You are moved by meeting classmates of the same sex, something you’d never experienced before. You become accustomed to interacting with the unique girls and your self-sufficient life after school. Then, during a class one day, the health teacher, Hirari-chan, announced abruptly without even a proper greeting:
“Starting today, you will all be having sex!”

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