@3hu @Yukari_Kajiwara @Groomschild :cirno_stare2: Not entirely. There's a good chunk of youkai like Kogasa that live off of people in a completely different sense (their fear and emotions). If you were to consider the fairies yokai, then they live only off of nature existing, not needing sustenance. Quite a number of them have special needs, not just eating people. We have barely any who eat people compared to those who don't. Yukari's whole thing with outsiders is only an issue for a small number of named yokai, and it's been stated people have escaped to become a human villager or get back through the border before. You also have to remember that the bigger part of keeping these youkai alive is having people believe they exist, knowing about them, and fearing them, which was the main point of Gensokyo.