Premieres October 6th. The new PV is here. Check out the ANN article for additional information. Synopsis for the first season from AniList:

Percival is a kind boy who lives out on the frontier called “Finger of God” along with his grandfather. However, the world was not kind enough to let peace and tranquility last for long. An encounter with a mysterious knight changed their destiny, and a shocking truth comes to light. The boy then sets off on an endless journey.