The Gentlemen's Alliance Cross

is a shojo manga by Arina Tanemura. It was serialized in Ribon from 2004 to 2008, and collected into eleven volumes by Shueisha.

Viz Media licensed it for release in North America and subsequently published each volume until the last one in April 2010. Viz also, published the art book in 2009.

Plot
Haine Otomiya, a 15-year-old high school student at the elite private Imperial Academy, was apparently sold to the Otomiya family by her father, Kazuhito Kamiya, for 50 million yen. Disoriented with her place in life, she became a gang member until she met Shizumasa Tōgū, who told her to live life how she wanted to. Recognizing Shizumasa as the author of a treasured picture book given to her from father, Haine reformed herself and entered the Imperial Academy to try and win his love.

Other Wikis

 * Arina Tanemura Wiki - Wikia on the series creator.
 * w:c:gentlemensalliancecross
 * w:c:thegentlemensalliance