Isekai Harem Paradise Bangai-hen: Kinyoku no Sister no Kuni

Moteuchi Kei is a young man from our world, who one day finds himself summoned into the fantasy world of his favorite videogame, Harem Paradise! This world is filled with buxom babes… and ONLY buxom babes, without a man in sight to help replenish the population! So you know what that means: Kei has to breed as many women as he can!
In this extra after story, Kei travels to a new country, a theocracy run by nuns who have all sworn an oath of celibacy! To fulfill his mission, how will Kei convince this celibate nation to mate with him to save their population?!
(Source: HMarket)