 The game revolves around Roxas, who was first featured at the beginning of Kingdom Hearts II. Roxas is the Nobody of Sora, the series'protagonist, born when Sora's body vanished as he briefly lost his heart and became a Heartless, and joining Organization XIII, a group of powerful Nobodies who serve as the antagonists of Kingdom Hearts: Chain of Memories and Kingdom Hearts II. Like Sora, Roxas has the power to wield the Keyblade, a weapon normally used for battling darkness. The other members of Organization XIII play a prominent role as well, particularly Axel, Roxas's best friend who debuted in Chain of Memories. The game also introduces a new member: Xion, a girl who resembles Sora's friend Kairi and, like Roxas, can wield the Keyblade.
