XIII機関
"Kingdom Hearts 358/2 Days", a prequel to "Kingdom Hearts II", reveals Roxas' life with Organization XIII. Unlike the other Organization members, he 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 Oblivion, Roxas is partnered with Xion, the Organization's 14th member and another Keyblade wielder, whom he befriends. Roxas reacts to Sora's memory restoration and starts questioning why he uses the Keyblade, doubting the Organization's motives. When he discovers that Xion is a replica created by Xemnas from Sora's memories, Roxas is compelled to defect from Organization XIII to find answers and meet Sora. After doing so, he encounters Xion, who has been repurposed by Xemnas to absorb him so that she can become a complete replica; however, the fight ends with Xion's defeat, and she entrusts Roxas with freeing the hearts captured by the Organization. On his way to face Xemnas, Roxas is confronted by Riku, who knocks him unconscious in order to help DiZ and Naminé wake Sora.