The world of the Monster Girl Encyclopedia is one of varied locations and storied history. Gods and monsters mingle with ordinary humans, elves and dwarves in a land of swords, sorcery, and most of all sex. Although the monsters are , much of the broader detail of the world is only hazily defined. For the vast majority of its history, the world wasn't sex-crazed at all; succubus ascendency is something new. Medieval peasants, knights, wizards and even deities struggle to adapt in a new world order where lust reigns supreme, and axe-wounds defeat far more armies than sword-wounds.