Final Fantasy

Kingdom Hearts: Chain of Memories / KHCoM

Final Fantasy XII Ashe
Storyline
After closing Kingdom Hearts Sora found himself at a crossroads, the Enigmatic Man stood before him and told him that if he took the road forward he would find something he needs but lose something he also needs.
Sora, Donald and Goofy found themselves at Castle Oblivion, a castle which was run by Organisation XIII. On the base floor Sora was given a card from Axel after defeating him, as he progressed through the castle Sora and Co began to lose their memories and have new ones implanted by Namine, Kairi's Nobody.
On the thirteenth floor Sora and Marluxia battled and Sora defeated him, afterwards Namine tells Sora about him memories and puts him to sleep for a year to regain his lost memories.