The Gentlemen's Alliance Cross (紳士同盟†, Shinshi Dōmei Kurosu) is a Japanese shōjo manga series written and illustrated by Arina Tanemura.

Recognizing Shizumasa as the author of a treasured picture book given to her by her father, Haine reformed herself and entered the Imperial Academy to try and win his love.

Through various circumstances, the Bronze-ranked Haine is tricked into becoming Shizumasa's bodyguard and assigned the special rank of Platinum - which designates her as the Koutei's companion.

Their relationship is strained by Haine's uncertainty as to whether she loves Shizumasa, whose kind words saved her during her darkest crisis of identity, or Takanari, who is revealed to be the author of her beloved storybook.

[6] Under the pseudonym "Meguro Teikoku", Tanemura has also self-published unofficial dōjinshi of the series and sold limited copies exclusively at Comiket in December 2014.

In June 2008, Shueisha published an artbook for the series entitled Shinshi Dōmei Kurosu Tanemura Arina Irasuto Shū (「紳士同盟クロス」種村有菜イラスト集).

[30][31] In 2004, Shueisha released drama CD adaptation of the first chapter along with Cactus's Secret, as a mail-order gift in the December 2004 issue of Ribon.