I regressed back in time to exactly 1,000 days before the absolute destruction of the world. In my past life, humanity was completely wiped out because they weren't prepared for the sudden, brutal onset of the apocalypse—and my lazy, completely defenseless older sister was one of the very first to perish. Knowing the horrific monsters and lawless hellscape that await us, I refuse to let her die a tragic death this time around.
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