After I met that catgirl, my questlist got too long! [RPG][English]

While on a patrol mission, Vera sees a thunderbolt hit the Elder Tree in the forest. Curious about the mysterious phenomenon—the sky is clear, after all—she approaches the location.
…wait, what is a catgirl doing there? And why does she claim to come from another world called ‘London’? Everybody knows the world is called Morpheya.