 Kingdom Hearts 358 / 2 Days , a prequel to Kingdom Hearts II , reveals Roxas ' life with Organization XIII . Unlike the other Organization members , Roxas lacks 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 <unk> , Roxas is entrusted with Xion , another Keyblade <unk> , whom he befriends . Roxas reacts to Sora 's memory restoration and starts questioning why he uses the Keyblade and doubt the Organization 's motives . When he discovers that Xion is a replica of Sora created by Xemnas , Roxas is compelled to <unk> from Organization XIII to find answers and meet Sora . After doing so , he encounters Xion , who tries to attack and absorb him so that she would become the " real " Sora ; however , the fight ends with Xion 's defeat who <unk> Roxas to free the hearts the Organization captured . The death of his friend , coupled with full knowledge of how <unk> Xemnas truly is , inspires Roxas to defeat Xemnas and release the hearts he and Xion captured for the Organization . On his way , Roxas is confronted by <unk> who knocks him unconscious in order to help Ansem and Naminé wake up Sora . 
