Blood Umbra: Sonata of Somber

In the year 2025, Before Anthrumans existed, the Earth belonged to humans once before, but a war broke out between the humans and a supernatural evil.
Soon the Humans won that war but they all suddenly disappeared without a trace. The only things that survived and inhabited the Earth were animals and plants , then something miracle happened, animals started to walk like humans and think like humans but they kept their animal-like features. Then eventually they became like humans and started to build a society, cities, towns, and rebuilding the world where humanity once ruled. The Anthrumans gathered information from things made from humans like books, videos, technology, and understanding humanity's past but it didn't show anything or talked about the mysterious war.
Now in the year is 3022, that same evil is back, now it's up to an Athruman named Nathan and his friends and soon to be ally to stop a Vampire Lord and his army of monsters and other horrors from taking over.