The main manga adaptation of the game Togainu no Chi.

The Igura: a deadly battle game where players stake their lives in the ruined city of Toshima. In a post-apocalyptic Japan where the underworld rules the day, Akira is placed in jail for murder. He's given a chance at freedom if he can win the game. Whether he finds victory, death, or even love, he will be in for the fight of his life! Based on the ground-breaking bishonen game!

(Source: Tokyopop)