Hi there everyone. This is an idea that just popped into my head a short while ago and I thought I'd see if it could get some wings here. The basic premise is a sort of post-apocalyptic game with a little Front Mission-style mech play and kaiju action.
Taking place in the far future, global warming and environmental destruction have wreaked havoc with the world. Massive flooding has swallowed much of the land. scientists created an airborne microorganism that was supposed to be released into the atmosphere and consume pollutants in order to help stop global warming. It did that but, unexpectedly, it also infected anything with a Y chromosome with a fatal illness. To add to this run of apocalyptic misfortune, this is also around the time man makes first contact with an alien race. They are not friendly. With the male population dying, many major cities underwater, and alien invaders and their massive machines and monsters of war rampaging across the globe, humanity faces extinction. Somehow humans cling to life and scientists manage to twist DNA around their fingers one more time, creating the Fu-Gene, making some women into futanari so that the world can repopulate. A few years after this, a team of German scientists create the Wanzer (short for 'wanderungpanzer' or 'walking tank') which packs enough firepower to beat back the aliens. These Wanzer require two pilots in perfect sync (a la Pacific Rim) in order to manage the attack and defense systems at the same time. This is usually a couple, generally a futanari and her partner. A school is developed specifically to train these young women. There they'll learn how to pilot Wanzers, and find the person they bond closely with so they can pilot it in real combat.
That's basically it. In summation;
-All female or futanari characters
-World populated entirely by women
-Action, sex, romance