Linne, a young woman who goes by the in-game name Rinne, logs into the highly anticipated VRMMO Meltis Online expecting a standard guided experience. Annoyed by the persistent and unhelpful angel assigned as her in-game guide, she punches it in frustration. This off-script action triggers a hidden event: the Advent of the Demon God Babylon. A gothic-lolita-styled evil goddess appears and, amused by Linne's chaotic behavior, offers her the rare and hidden job of Necromancer.

The story is set within the immersive virtual world of Meltis Online, a game designed with layers of secret events, rare monster encounters, and hidden classes. Linne quickly discovers that her innate skill allows her to befriend and tame rare monsters rather than simply defeating them. Using this ability, she strengthens and evolves her creature companions with surprising ease. Her party grows as she makes one chaotic choice after another, and she begins unlocking more hidden events far ahead of the typical player progression. As she crushes enemies through overwhelming teamwork, her power swells to the point where she and her group become a threat to the entire game world. The light novel follows her accidental path from a frustrated newbie to a disaster-class rookie, with the world-ending consequences of triggering those secret events too quickly looming in the background.