Everything was normal until they took over.

Who are "they"?

Well, "they" are monsters. (you can design the monsters)

No one fights back...it results in death so I mean-

But there is hope.

The undead. They can't die again. They can get their bodies torn apart or something but not die.

So that's why the people hired a witch (the mc).

The witch rose the dead and is now their leader.

Finish the story~