^TBF, PMiSS back in 2006 had Ran and Yuuka among others openly visiting the village, or the Prismrivers putting on concerts for humans. Even in the most recent materials youkai doing business in the village wear enough of a disguise to let both sides maintain a polite fiction that the nice lady selling you drugs or tools is just a human.
Anyway, this series is just as good on a reread as the first time. Yuuka's depicted with a not-very-alien personality, which I think is a missed opportunity, but it still works for the story the author wanted to tell. A nice Yuuka is good too.