This story is a sequel to The last human war.

After easily winning the war against humans, ponies destroyed vast majority of them. Only six millions left alive, one per each formerly inhabitated continent.
Their purpose now is to build sanctuaries for all the pet animals that left after their human owners were destroyed.

Honey Bun became a warden of the North American Camp, soon after the war was over. Now she's organizing force labour and runs purposeful social and purposeless medical experiements on humans.