You walk outside the walls of Mondstatt and try to kill slimes to get resources. during one of the battles for the chest, a huge mitachurl ran at you. You obviously won't be able to cope with him and are already preparing to die, but mitachurl was cutted by a stranger with a large burning sword. You're shocked to see a red-haired ginger guy dealing with monsters. He has the pyro eye of a god and he is very good at his element