xxxHOLiC, Fukigen na Mononokean Recommendations
Same type of story, a boy that want to someone help him with a yokai and finished with a due, and help his heroe
Without a house like xxxholic, fukigen have a room that move out to call it, but only a person can make other see that
A shopkeep/master help a boy who is plagued with afflictions because of yokai. In exchange for their help, the boy ends up working for them to pay off their debt. WHile both are enjoyable, Fukigen na Mononokean has a more lighthearted air about it while xxxHolic occasionally is serious. Both are still a great watch though!
-Both animes about yokai
-Main character is in debt, and has to pay it off so they get hired as an assistant
-Both go on adventures
-Help out other yokai/humans
When I first read the summary, I thought it was almost exactly the same. A high school boy who is being troubled by yokai finds a mysterious stranger to help him. However, the price is that he has to work for the exorcist until he pays off his debt for being free of the yokai.
In these series you'll explore various settings of the spirit world and its inhabitants, some are well meaning while others have devious plans.