 Someone (this person is unknown) calls her name, and she turns around towards this person with a smile.Whether Aiko was able to stay alive from her near-death state, escape from the destroyed building complex, heal to her healthy state and move on to live a new life with new friends, as seen as she is in a heavily populated area at the end of the story, is unknown, especially since it's unclear whether the Aiko seen at the end of the story is the real and living Aiko, and not a ghost of her.It's very possible that Aiko is very much alive as seen in the ending where she's alive and well, but the events on how she was able to stay alive and recover, from the time she was awake heavily injured to her walking in a city with all her limbs back where someone called her, are unexplained.