[Demonskid]

you don't need to watch Card Captor Sakura to know anything about xxxholic. that would mainly be for Tsubasa.. even then, since Tsubasa is a different story/alt universe you don't really need CCS.

As for Magic Knight Rayearth. Only if you want to know where the Mokona come from. xD So many people think Mokona-tachi originally came from Holic and it's like.. um ._., Magic Knight came out first, and its even said in holic that Mokona-tachi were cloned from the original...

the only one you need to make sense of the story is tsubasa..

Make clamp work on Drug&Drop ;-;

Drug and Drop has characters from WISH.. -not gonna say who/what though-