Reimu smiled a little when she saw someone else, but her smile quickly faded when she saw what they were.  She hid for a bit, simply watching them, but it looked like they were just ordinary people.... not quite human, but they seemed friendly enough.  She stepped out in front of them, letting them see her from a good distance before walking towards them - she didn't want them to think she was sneaking up on them, or anything.  "Hello there," she called out when they came close, a little shy.