Celia, who had been a puppet playing to the tune of the government, spent her life fighting creatures called "Visitors", who had been invading earth for centuries, for as long as she could remember. Together with Pan, her partner in crime and a Visitor of Special Grade himself, all she wanted was to survive.

Yet, after dying unexpectedly of heart attack one day, she woke up and found herself as an inconsequential villainess from "The Saintess' Unbreakable Shield" - a novel she had once read. Rowena Dynari van Varnhagen, the daughter of the only Grand Duke of the Arlen Empire.Said villainess, equipped with a few minor... personality quirks, offended the female lead at the beginning, and, soon after, was promptly cut right out of the story, due to sudden pneumonia.

Determined not to let people trample on, and use her again, Celia - no, Rowena - decides to fight for a future worth having.

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