This game explores on the past of Roxas, as he was working under Organization XIII. As Roxas enters the briefing room, where an incomplete Kingdom Hearts can be seen from a window, second in command, Saix, gives out orders. As time passes by, Roxas develops a close friendship with member, Axel, and a mysterious girl who also happens to be linked to Sora, Xion. Within the darkness, Riku plays a prominent role in this story. Though, Riku is viewed differently. In Roxas' eyes........he is the enemy.