Seikimatsu Tanemaki Densetsu: Shoujo Yuugi -Ai no tame ni Shine!-

Since the 1970 the new technologies and introduction of computers resulted in deviation in the male reproductive ability. At the beginning of the 1990s more than 60% of men lost "male function", and women got frustrated with more and more incidents of men raped by women to occur. By 2000 the civilization was about to ruin due to women violence.

Kentaro's sister Yuriko got kidnapped mysterious "Lolita invaders" squadron. Kentaro tried to stop them but got defeated by their captain Yui. A strange old man instructs him how to get to their city base, but now the encounter will be on his terms.

[From vndbreview]