[Haunted Evil Pajamas]

I really hope I'm not asking for a lot, and I'm almost positive this was asked for already and I suck as navigating forums, but can KO'd youkai automatically be brought back to 1 HP after a fight?
I know bleeding hearts exist and it's awesome that one of them restores all of your youkai at once, but there's no reliable way to obtain them, so if the above is not to anyone's liking, maybe we can have a shop somewhere that sells bleeding hearts...regardless of how morbid that sounds?