In a world where vampires and humans coexist, the population between humans starts decreasing out of the blue...

Wait! The past is the past. Now, let's go to the future!

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The world became full of wolves, vampires, and other mystical creatures. Now, humans made around twenty five percent of the population.

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This feels like exposition, but you can expand further, and turn this prompt in whatever kind of story you would like. Anyways, bye bye.