Kimomen Demo Kyokon nara School Caste no Chouten ni Tateru!? Gakuen Ichi no Motekawa Shuudan ni Tanetsuke Shimakuri! Yume no Gakuen Harem! - 4GamesList

In the near future, where men's penises and purposes had shrunk to miniscule size, the birth-rate had dropped to dangerous lows. Everything came down to one valuable asset: having a massive cock! ...