Anime about a girl found by the lead character in the ruins in the sky who attracted a monster to a village inhabited by spirits
Sounds like Tales of Zestiria: Doushi no Yoake.

It had an OVA produced by Ufotable and aired last December 2014 in order to promote the original game.


  The story focuses on Sorey who goes on a quest to restore peace on their homeland. The woman you might be referring to is Alisha, the brown-haired girl from the picture, whom Sorey, the dark brown-haired guy, and Mikleo, the white-haired one, met when they were exploring these said ruins. They brought her to Sorey's land, which was inhabited by these spirits, where only Sorey could actually see them. 


Source: Wikipedia