The series will come in October 3.

The Official website for the Anime of Asterisk Wars. Let´s check it out:

Based on the Light Novels of the same name. Aniplex has revealed the story, which is as follows:

In the previous century, humanity was attacked by an unprecedented disaster... The impact “Invertia.” The whole world was destroyed. However, humans acquired a newpotential...”The Genestella.”