If you loved xxxHolic: Rō, try xxxHOLiC The Movie: A Midsummer Night's Dream
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Tsutomu Mizushima, and they sit in Animation / Mystery territory. If that's the register that drew you to xxxHolic: Rō, the second film will land in a comparable space — through a different lens.
What xxxHOLiC The Movie: A Midsummer Night's Dream is
Mansion gates. Summer dusk. Wind chimes. Yūko, Watanuki, and Domeki arrive at a collector's gathering, soon stalked by eerie disappearances. Each guest harbors a hidden desire, and the house itself seems to anticipate their doom. Early work from Production I.G offers elegant chills.

