In a world where demons are sealed in the depths of the earth, dungeons are summoned from the depths of the earth and plot to invade the earth!

Karen, a veteran S-class adventurer, is asked to retrieve the dungeon’s treasure. However, the treasure was the hidden treasure of the beast god Gaira. Karen incurs the Beast God’s wrath and is cursed with the “Curse of Reproduction”! After a battle, she always comes into heat, and her body is changed by the curse. She is forced to become pregnant when she has sex with a man she recognizes as mate…! In order to break the curse, she heads for Susannad.