xxxHOLiC, Tokyo Babylon Recommendations
The same creators, and the storyline is similar. in both manga there are ghosts and spirint involed.
Both beloved CLAMP masterpieces, Tokyo Babylon is about exorcising ghosts, while xxxHOLiC focuses more on what the spirit world is like. If you've read and enjoyed one, you'll definitely love the other. Both happen to be pretty depressing, but TB takes heartwrenching to a whole new level.