M3 the dark metal - Episode 1

Humanity, it seems, is in a tight spot (although when it isn't it in anime?), with those that remaining living on the outskirts of a darkness known as the Lightless Realm which has swallowed up everything and everyone in its path, and continues to expand. From these dark depths come strange creatures known as Admonitions, and guardians of the realm known as Corpses.

It isn't all bad news