Hey all, trying to find a manga from years ago. Shoujo fantasy, it was set in a small village and followed 4 friends (2 girls and 2 guys I think). Everything is normal until something happens and they find out a big village secret which relates to one of the girl's finding out she's actually a demon? Or is possessed by one? And she keeps transforming into the demon and she either fights evil or is evil. I can't remember a lot of details sorry. Final thing I remember is the author had another more well-known series, and in the epilogue of THAT series there was a crossover with the series I'm looking for (ended up having huge spoilers as the series I want hadn't finished scanlating).

Thank you!

[BOYS OVER ACTING]

I think this is
Yuki wa Jigoku ni Ochiru no ka

It is!! Thank you so much, this has been driving me absolutely mad!

[BOYS OVER ACTING]