Sometimes, only the best will do. You want a newhalf to spend time with in Tokyo, but she must be classy and sophisticated. Only a newhalf like Narumi will do, because she is so beautiful and can move in any crowd.
You are certainly not lacking for choice of escorts in Tokyo, but why not get a really lovely one? If you have to meet a client or a customer, not any ol’ newhalf will do. You want a sophisticated and very passable one, who will impress whoever you meet with her beauty, and Narumi will certainly do that.