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After Aya Tokoyogi stole Natsuki Minamiya's memories and time from her completely, she became an ordinary human girl who turned back into a kid. Thus she has no recollection of certain past events, nor can she remember her name and can't use any magic abilities.
After she was wrapped away from the Demon prison she immediately thought Asagi Aiba was her mother. She was then named Sana-chan by Asagi which she seems to like.