The Traveler (who is Lumine) an interstellar adventurer who is separated from their twin sibling after the two land in Teyvat. By the Unknown God. Capturing Aether in one of her cubes, and Lumine having to land on Teyvat without her brother.

With a robot named Optimus Prime who also landed on Teyvat for some reason, the two team up to explore the world of Teyvat and find Aether. Also encountering Paimon.