I just finished reading the slightly obscure and sometimes hard to find Clamp series Clover. It came out several years ago, and I think some volumes may be out of print. I gradually accumulated all the volumes over a long period of tracking them down in several stores. The art is flipped, the books are larger than the now standard manga volume size, and all the books have slipcovers.

Clover is set at an unspecified time in the future, in a cyberpunk world where animals are actually machines, and humans have implants which give them extraordinary powers. Kazuhiko, an ex-military man turned civilian, is given the task of delivering a package who turns out to be a girl named Sue who has been locked up by the government. Naturally when he attempts to take her to her destination complications occur and then things start to get strange….

If you don’t already like Clamp’s style, this might not be the book for you. The plot and characters of Clover are slowly revealed in a non-linear fashion, and the storyline is tied together with fragments of song lyrics. So much of Clover is expressed through the art, which uses whitespace and layout very effectively. Some panels evoked a response that I’d usually get when looking at calligraphy or poetry instead of a page of a comic book. You can get a sense of the art on Tokyopop’s preview page. Translations of the Japanese section titles are included along with the original Japanese.

Volumes 1 and 2 focus on Sue and Kazuhiko, Volume 3 is a prequel to their story, and Volume 4 focuses on the backstory of two of the characters who aid Sue and Kazuhiko on their journey.
Motivations and plot points aren’t spelled out for the reader, so you are left with a sense of mystery which combines with the art to produce a unique reading experience. This series really seems to stand apart (in a good way) from some of the other series by Clamp that I’ve already read and enjoyed.
Fairy Park is an extensive Clover fan site.