Huh, it's interesting that Sister Dahlia mentioned that Yvonne's farther has really helped the town out over the years. Up until this point we've had an unclear picture about her close family/ parents. She deeply cares for them, but doesn't refute them being corrupt nobles. This is the first time we've heard anything to the contrary to them being corrupt.
I like the idea of a demon converting to whatever religion they'd normally be opposed to. Even though the demons in this seem to be less like actual demons and more just demony mortals. Which is the case for a lot of eastern media.