She had felt a sense of frustration for a long time. She was always dissatisfied with the fact that, despite honing her sword skills, she could not actually use them in modern society.
Then, one day, the zombie outbreak arrived. It was a life-threatening terror, but at the same time, it was the moment a world opened up where she could freely use her suppressed swordsmanship.
By swinging her sword to her heart's content to harm people and kill zombies, she was able to feel true freedom.
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