In a world where only women can receive the “Goddess’s Blessing,” men have become obsolete. Women give birth through prayers to the goddess, and men are discriminated against and oppressed simply for being male. Libido, a male slave in a female adventurer party, is left as bait during a dungeon crisis and meets a gruesome death deep within the labyrinth. "I’m not going to die here… still a virgin!" Even in a world where men are oppressed, Libido awakens a tremendous sexual drive that triggers a unique ability: “Ever-Changing,” a cheat skill that lets him identify others’ sexual desires and transform to fulfill them. Armed with this ultimate power, Libido sets out on a path of revenge against the women who looked down on him and all men.