There can't be that many man-eating youkai.

Sure, we might've eaten people on the Outside, but it's different over here. The Hakurei shrine maiden keeps an eye on Gensokyo, after all.

If anything, there are lots of youkai using their powers

while taking human form, getting into contact with them and living among them.

"Whether it's fine to eat people" used to be the barrier separating us from them, but that seems to have already disappeared.

Say, Mystia... Wonder what's the difference between humans and youkai?