Shomin Sample by Takafumi Nanatsuki

Translated from Japanese Comedy Romance School Life Harem Ecchi
Kimito Kagurazaka is an ordinary high school student. One day, he is enrolled in a school where its female students are cut off from the rest of the world to keep their innocence. This comes after a large number of graduates fail to cope with the outside world.
However, the school thinks that Kagurazaka is a homosexual with a muscle fetish, but Kagurazaka has no choice but to cooperate after he learns that the alternative is castration.

Alternative names :

Volume 1
Volume 2
Volume 3