Plot/Story
It's the story about Watanuki Kimihiro, a boy who can see the spirits. He doesn't want to see them anymore, and one day he is guided to a store of wishes, where the witch Yuuko will help him If he works for her until pay the wish's price.

Characters
CLAMP style - all the characters are beautifully drawn, each with a unique touch to them. All the characters have unique personalties, none of them are bland at all. Did I mention the relationships that the main characters have are hilarious?

Drawing Style
It's a manga by CLAMP. So it's gotta be awesome and in xxxHOLIC, it is!

Enjoyment
I really enjoyed the first 3 volumes, although it has all been character development and minor stories, but with plenty of laughs. There are parts where they are perhaps 'hinting' at a plot but so far there isn't. But CLAMP doesn't disappoint - So I'll be looking forward to their work!

Overall
Great Manga by CLAMP, although there isn't much plot(if any at all), they are developing the characters very descriptively and carefully.