In order to fulfill his wish of not seeing spirits anymore, Yuko pretends to be payed. So Watanuki will work part-time at her shop, and this is where the fun part comes!
The idea of a wish-fulfilling shop sounds very nice to me! Every wish that Yuko grants leads Watanuki to a little adventure, which usually involves other characters, a few spirits and a large dose of humor!
It's a great mix of fantasy, comical and horror.
The art is the so-called CLAMP new style. The characters appear to have a very long and skinny body.
The main character, Watanuki, has a weird personality, and he can turn from wonderfully happy (when he talks to the girl he likes) to gloomy and depressed in a second. Nonetheless, this is very funny!
Yuko has a fun personality too, she is good with her job but she usually drinks and laughs a lot... so yeah... she is cherish and Watanuki sometimes gets really angry with her and there are some fun gags.
I had great fun reading xxxHolic, especially because I'm also reading Tsubasa and the stories are mixed, the characters are the same, and they sometimes communicate. So if I read Tsubasa and then I read xxxHolic, sometimes it's like reading each one two times (And I don't really mind, because I love them both!).
So it may only be a matter of personal taste because I love CLAMP comics, but I suggest you to read xxxHolic.
