What are you? Human! With super special Shinto/senshi powers.
Do you exude some sort of supernatural energy or an aura? Rei has the ability to sense supernatural energy/aura, much like the Seller does! She wields a certain about of spiritual power, plus she has the embodiment of Mars hanging out inside of her.
Would you like to not be noticed? I'm not sure whether or not she would feel weird to him, but if so, feel free! :)