(Playing downloaded version) I ran into a bizarre bug, after starting the quest to find out where the paper came from and defeating the demon, wanting to sleep without a bedmate doesn't increase the day. I've tried "main shrine" and Larklast (after taking care of Nue) and it doesn't increase the day. Sleeping with a bedmate works normally however.
Also, there was a really weird glitch (that I haven't been able to reproduce) that for one battle, I had a HP of 69 (!), lost to something, then it went back to what I actually did have for HP. For that one battle, I had something like wings from the Divine by my name, too. I do remember that I had it the first time I tried to fight the demon, but not sure if that meant anything. Was really weird going from about 1100 to 69 HP... Also not sure if I can do anything with quest 7 after defeating the demon, there's not any real leads!