Twenty-four years after the mysterious disappearance of the mindless rampaging demon known as Gluttony, a young woman leaves her home in the monster-infested Underground for the first time in her life—Pepper Black, a muscle-brained protein addict with a penchant for pretty girls and indiscriminate violence, embarks on her very first journey to the Outside.

Fighting against four-armed goblins, protein deficiency, accusations of sexual harassment, as well as a peculiar Curse that forces her to vomit random objects from another world, what was supposed to be a simple shopping trip with her sister quickly throws Pepper onto a path that may well determine the entire fate of the world...