もんむす・くえすと！前章 負ければ妖女に犯される/ Monster Girl Quest

Monster Girl Quest: Chapter 1 (official name: Monmusu Quest! Origins -Assaulted by the Vamp-) is the first chapter of the Monster Girl Quest trilogy, released on 10 Mar 2011. The story takes place on the continent of Ilias and in the regions Natalia and Safina on the continent of Sentora.

In a world where monsters take the forms of women who lust after a substance only men can give them, one boy is fated to change everything forever. And to continuously get raped doing so. The plot starts when Luka, hero of this story, has a dream of the goddess Ilias who commands him to take up arms, become a hero worthy of her and slay the Monster Lord whose legions of monster girls attack humans everywhere.