Help me find this manga!!

I cannot remember the name but I can recall significant details. The manga follows a salaryman trying to purify a haunted house they sold to an old couple. Note, our protagonist is an extremely dedicated worker for their salary because they are trying to pay for medical bills. Anyways at the house I forgot how but after opening a chest/coffin they find a girl. This girl was supposedly the youngest sibling of the family that had once lived in the haunted house. Unfortunately, she was killed by her siblings for some reason. Our protagonists and the girl then agree to work together after some debate and conflict. Apparently, all her siblings are hunting the girl to put her back in tje coffin/chest because of some reason that we dont know yet. The protagonists goal is to purify the old house for the old couple and earn money and the girls goal is to discover her families secrets as to why they want her gone.

As I know it's still an ongoing manga. It's a really good read that I enjoyed and I really want to find so I'd appreciate any help!!