*Author’s note: This story is Public, if you have an idea, start writing (but please read the rules first)! If you are not sure about something you want to write, feel free to ask me anytime!*

Mankind faced the threat of extinction, as a strange epidemic eradicated all men. To save humanity, an ancient witch circle stepped out of the shadows and taught the people their art; the art to summon a demon and merge with it, becoming a futanari. With this, humans could prevail.

Today, the countries' governments are stable once again. The summoning of demons is strictly limited, only chosen elites are allowed to try and become futanari. The requirements, as well as legal handling, differ from country to country.