Vampiric Future

Entertainment sometimes shows humans becoming slaves of vampires, for blood and for turning into vampires themselves, one good example being Seraph of the End manga/anime series, but what if vampires existed and what if it had happened in reality?

Plot
One day, in 2010, a virus outbreak had occurred that killed off all humans over 13, the vampires (which became real for some reason, possibly through Universe Travel) came out of the darkest of shadows, and the vampires had enslaved and farmed humanity for their blood and turning into vampires, and changed most of human cities into progenitor councils, castles, etc that resemble ones from Seraph of the End, with technologies that function the same way. However, life continues, despite the mass extinction occurring in most species, some were adaptable enough to adapt to a world dominated by vampires. This future, called Vampiric Future takes place in 25 million years from now, where humans and vampires remained unchanged while other species that survived had adapted to live in the vampiric future. Most large creatures like giraffes, bison, antelopes, lions, tigers, etc will sadly go extinct because of vampires, but few such as elephants, alligators, bears, deer, Dylanusids, etc will survive and evolved to deal with vampires around.