I need help finding an anime name I cannot remember.

Hey guys. I know this may seem silly to some, but I would love some help finding the name of an anime I watched a long time ago, but cannot remember the name of it. It was on Cartoon Network and it was years ago! It was a horror one, or so I think. It was creepy, dark, and had spirits involved. I remember there was a boy and a girl who I believe had spirits who were fighting an evil spirit, and there was an old lady who was doing something in her house. There also might have been a school building near all of this. It all took place t night in the anime, and it was honestly really creepy! I know this is not the best description of it, but I really want to find out what anime this was! I tried researching and doing everything, but this was of no use. If anyone has any ideas of what it could be, please do share! I would love to watch it, for I only saw one episode of it. Thank you! :)