Kingdom Hearts 358 / 2 Days , a prequel to Kingdom Hearts II , reveal Roxas ' life with Organization XIII . Unlike the other Organization members , Roxas lack memories of his previous life . During Roxas ' time in the Organization , he is placed under Axel 's watch , and the two become friends . After Axel is sent to Castle Oblivion , Roxas is entrusted with Xion , another Keyblade wielder , whom he befriend . Roxas react to Sora 's memory restoration and start questioning why he use the Keyblade and doubt the Organization 's motives . When he discover that Xion is a replica of Sora created by Xemnas , Roxas is compelled to defect from Organization XIII to find answers and meet Sora . After doing so , he encounter Xion , who try to attack and absorb him so that she would become the " real " Sora ; however , the fight end with Xion 's defeat who entruts Roxas to free the hearts the Organization captured . The death of his friend , coupled with full knowledge of how deranged Xemnas truly is , inspire Roxas to defeat Xemnas and release the hearts he and Xion captured for the Organization . On his way , Roxas is confronted by Riku who knock him unconscious in order to help Ansem and Naminé wake up Sora .