Mars

Tokyopop Book Description: Kira, a shy high school student, lives only for her art. Rei is an arrogant, rebellious loner who wears his delinquency like a badge of honor. They are exact opposites in every way, but when Kira sees Rei kissing a statue of Mars, she overcomes her fears and asks him to model for her. And, to everyone's surprise, Rei agrees.

Mars: Horse With No Name
Published in Japan as Mars Gaiden: Namae no nai Uma (Mars Supplementary: Horse With No Name)

Prequel to Mars: Tatsuya's intense jealousy of class bad-boy Rei turns into an unexpected friendship, and Isamu is a troubled teen haunted by a tragic past he cannot change. [Tokyopop]