Tsubasa: RESERVoir CHRoNiCLE Volume 05: 08/18/12
Volume 5 of Tsubasa: Reservoir Chronicle by CLAMP is where the plot takes a left turn. The ghost princess of Spirit Town warns Sakura that someone is watching. Turns out many someones are watching and they all have a stake in the outcome of their search for Sakura's memories.
Meanwhile Sakura et al go to the Oto Country. Here's a point where the anime is actually sillier than the manga. The anime plays up the pseudonyms Fai picks for everyone: Big Dog, Little Dog, Big Cat, Little Cat and gets a lot of gags out of them.
Fans of other CLAMP series will notice a few familiar faces. These are other residents or visitors to Oto. Some are Oni (demon) fighters who fight alongside Syaoran and Kurogane.
For those who are also following xxxHolic, points of similarity between Syaoran and Watanuki are revealed.