It’s set in a fictional world with mostly men because of some genetic issues.
This adaptation consisted of 4 OVA’s so double the fun, right? Well, yes and no, unless you call unfinished work fun. It’s first adaptation was airing in 1992-1994 and it had 2 OVA’s. Ai no Kusabi (2012) is the newest adaptation of a light novel of the same name published in 1986-1987.