I called it, I knew Tanjiro was going to get turned into a Demon, whether or not he'll regain his sanity and have a happy ending it's still in the air. Will Nezuko sacrifice herself to save Tanjiro or will she fight him to the death? right now the only one who can fight is Nezuko. A last battle between the siblings would definitely be a good one, this manga doesn't need to have a good ending, I'm fine if it has a bitter sweet ending, making sacrifices all the way to the end and that'll make me respect the mangaka even more.