The Mad-Sex Human... In the year 20XX, a "Mad-Sex Virus" spread, causing anyone who had sex with an infected person to have their thought processes destroyed, lose their reason, and become a shell of a human who crazily sought only pleasure. Nations collapsed, and the world fell into ruin. The survivors lived in hiding, but at a certain research facility, men succeeded in capturing Ai, a Mad-Sex Human who had only recently been infected and still retained a sliver of her reason. The men aimed to study Ai and develop a vaccine, but stimulated by the scent of these men, Ai gradually awakened, and one by one, the men were devoured by her...