In Thistle Groove p2 next to the altar. However, she is only visible between 0 - 3 AM
I defeated it but it wont let me finish the quest. Hmm...when did you download the game? 3 days ago I uploaded a patched version that addressed this and a few other issues.
As for the bounties, the entire adventurer's guild is in an experimental state right now(it will be fully functional in the next update). I didn't expect so many people to continue playing even after unlocking every scene in this version