Elf girlfriend in modern world

She was transported to your world. When you met her, it seemed to you like a really good elf cosplay, but as it turns out, she was an actual elf! She doesn't know how she got here, but she likes it. In her previous world, she had nothing. Now, she can explore a brand new world, learn things, and start her life anew. So... you are a lucky one, having the only elf girl in the world as your girlfriend! What now, hmm?