WOAH WOAH WOAH ???? I would be the guy to say "RUN BOY RUN!!" but it's Ranna and it will be "GO FOR IT BOY, GO FOR IT!!". Still, this manga's pretty fun and exciting. One moment you get an ACTION PLOT then when you've reached a corner, you've got a Romance Plot. Wow. This is pretty unexpected and we couldn't predict where will the author takes his manga's plot to.
Mm, now I really hope that her being part of a family temple has something to do with her demon-like nature, and Rokudou's curse, that'd be interesting (though Ranna, show some restrain, come on hahaha)
Most probably, since Rokudou's cursed tatto is hiding under the stupid beret... Somehow the monk is gonna shock after seeing the mark and we'll have some plot development.
Gas pedal? She's smearing napalm all over the place, wearing tire around her neck in place of a wedding ring and dropping a lit match.
It's a bit too early to think about marriage gurl. Your love might fizzle out after a week or two and it'll turn out he used some kinda voodoo magic to ensnare you.
Finally a callback to the first chapter of the manga where we're told that the mark is some kind of things for sealing evil spirits. It's probably something like it was a Buddhist spell where one of the little squiggle sticks on Japanese writing was misplaced and it made some pun in Japanese like "Oh this spell is supposed to say 'Slay All Evil Oni' but the handwriting sucks and it says 'Lay All Evil Onna'." Then he'll fix the spell and this will become a manga about fighting evil ghosts.
Anyway, the dad will clearly approve of any man who can tame his reprobate daughter.